Palmstriker,
I understand the problem of accepting certain things I say because I am obviously just some random dude writing stuff on an internet forum, and writing something which conflicts which many consider as an authoritative go-to ressource on the internet.
But let me say this: Although it is a great ressource, it is also the cause of much confusion and leading people astray in their speculations. The information collected there is just a mish-mash of various stuff from any source the involved parties may have had access to with no verification, no vetting, no fact-checking, nothing. Theories and conclusions constructed on such information are not very reliable nor trustworthy.
I actually happen to know at least one of the persons involved in this project personally, and incidentally, he is the only one I would consider to have access to some more reliable information, the rest less so.
Unlike most others drawing on the ressource you referred to for knowledge, I am in the very fortunate position that I do not need to rely on what other people have written - I can actually go and ask the persons who wrote the articles you refer to and the people who might have told certain stories. I have been traveling to China to learn Wing Chun since 2004 and been living in Guangzhou/Foshan for a good decade and have met virtually all masters of name and rank you could possibly think of - and many others, no one in the West has ever heard of, but which nonetheless are the seniors of the various families.
Since you mention the article written by Yuen Jo Tong Sifu, I met him on many occasions. His home was just down the road from where I lived for a while, as was his school. My wife and I had lunch with him on several occasions and had the chance to discuss Gung Fu with him. He even gave us some personal copies of some articles he had written over the years. Unfortunately, he passed away a few months ago.
Now, those documents he mentions are nowhere to be found - we asked him specifically what archives he was referring to in his articles, but he dodged the question and referred us to some other articles he had written. We even asked the foremost local martial arts researcher who has access to government archives which are closed to the public if he over his 40 years of researching martial arts, but he had never seen such documents.
It is very important to understand that simply because some “offcial” story makes certain claims, it doesn’t mean it is fact - very often it is quite naive to believe so.
I also know some of the seniors of the Tang Yik Weng Chun-style in Hong Kong as well as in Foshan and met a senior master of the so-called Ban Jung Siu Lam Fung Siu Ching Wing Chun in Siuheng a couple of years ago and they have quite interesting stories to tell - quite divergent ones, in fact.
If you take the story told by the “Weng Chun” people and compare it with the official “Yuen Kei Saan” story as it relates to Fung Siu Ching there are some huge discrepancies - mainly relating to the timeframe. I already explained in my previous post that if what Yuen Jo Tong wrote was true, Fung Siu Ching passing away at 73 in 1936, we can conclude that he was born in 1864ish, however the Viceroy of Szechuan he was supposed to have been working for passed away in 1869. Does it sound plausible that Fung Siu Ching was a very famous bounty hunter or bodyguard for Law Bing Jeung?
This is an example of how historical fact, if one bothers to check, shows that certain stories cannot be entirely true.
Another example is this: the article claims Fung Siu Ching taught both Yuen brothers, however this is contradicted by the Yiu Choi-family, Yuen Chai Wan-lineage and even the person who was Yuen Jo Tong’s first teacher, the late master Leung Ngau, who in turn was, until his recent passing, the last living direct student of Yuen Kei Saan. According to these sources Yuen Chai Wan had already left Foshan in the very early 1930s, i.e. way before Fung Siu Ching was supposed to have been invited to teach there.
And more…
The Weng Chun style is a bit of a mess in a sense - i.e. it is not really a coherent style. It is actually a group of people who learnt martial arts from different sources, but all have one teacher in common, Fong Siu Ching. For example, Chu Chung Man actually learnt Choi Lei Fut and kept the forms he learnt (Fa Kuen, Peng Kuen, etc.), learnt pole from another source, then a dummy form and “Chong Kuen” from the Dong brothers. He taught all of this as “Weng Chun” yet the only stuff from Fung Siu Ching was what had been passed on to him by the Dongs. Something similar can be said for the Tang family Weng Chun: according to the recording of Tang Yik talking about the history of his art, a Tang ancestor called Tang Bun learnt an empty hand form (“Weng Chun Kuen”), a dummy form and the 6.5 pole from a monk (“Chi Sim”) at Fei Loi temple in Qingyuan. Later, other forms were added such as the Sheung Gung Kuen, Chong Kuen, a wooden dummy form from Fung Siu Ching, which Tang Suen, Tang Yik’s father picked up. Different stuff from different sources, and yet Tang Yik called everything “Weng Chun” (interestingly, this is a bit different from what his fathers other students in Mainland China do, but a different story).
So, the only stuff which came from Fung Siu Ching, if you want to go by the Weng Chun sources was a dummy form and the Chong Kuen (some say also the Weng Chun Kuen), but interestingly Yuen Kei Saan taught the three forms from Leung Jan’s lineage to his students such as Wong Jing, Sum Nung, Leung Ngau, etc. not the “Weng Chun Kuen” nor the wooden dummy form of that style. So where did Yuen Kei Saan then get his three forms from? Fok Bo Chuen? Some well known facts in Fatsaan: Yuen Chai Wan was 12 years older than Yuen Kei Saan, and learnt from Fok Bo Chuen (aka Gwok Bo Chuen) as a teenager. Yuen Kei Saan was VERY young at that time… Interestingly, Yuen Chai Wan did not teach any Cham Kiu or Biu Zi forms, so we can assume that if at all, Fok Bo Chuen just taught SLT. So where did Yuen Kei Saan’s other forms come from? The answer is obvious if one knows certain other stories, but as it is a sensitive issue, I shall not go into further detail here.
Virtually all official stories of various masters suffer from this kind of problems, with Yip Man there are quite a few things his followers like to believe which can be proven to be false, but since Yip Man is not the point of discussion here… Chan Yu Min is another example… Leung Jan… etc.
As far as Fung Siu Ching goes, well many stories say many things, but some local researchers have actually identified his home village, and it is not in the north of China, further he was a rather normal, very low key person.
I don’t understand how anyone could possibly see the sameness of the Chen style with Yuen Kei Saan style Wing Chun - it is utterly different! The way to move and to generate power, absolutely not the same. As a 12 year practitioner of a YKS derived style and extensive exchanges and training with masters and students of that lineage in Guangzhou and Foshan, I must say that your video demonstrates very clearly that those two styles have absolutely nothing to do with each other. If we look at this from a historical approach, the Chen family martial art was first taught to an outsider from ca. 1840 - 1850 (Yang Luchan) who then went on to teach his own martial art to the public. The Chen family art remained closed - so where would Fung Siu Ching have learned this art? And how would it have found its way into the three forms of Yuen Kei Saan given the fact that Fung Siu Ching didn’t teach those forms and that according to the history Fung just taught some close body skills and Kam La? And looking at the other forms which are supposed to descend from Fung Siu Ching (Weng Chun), they don’t move like that at all, nor do they Faat Geng in the manner of Chen style Taiji.
Chen style in Yuen Kei Saan’s Wing Chun? Makes no sense whatsoever… But of course if we believ in certain stories, confirmation bias allows us to see a lot of stuff which is not actually there.
Of course, I don’t need to tell you what the YKS/SN practitioners here will tell you if you suggest their art is like Chen style Taijiquan…
It should be quite clear.

As far as the speculation in the article about Fung Siu Ching you linked to, I must say it is quite a mess because it is trying to synthesize a lot of different information some of which is quite inaccurate and demonstrably wrong. It cannot be taken very seriously if you have really looked into the subject.
If people really want to know about this, I would recommend travelling to China to find information for themselves instead of blindly relying on various information picked up through articles and on internet discussion forums. Some information is good, but unfortunately most is rubbish…