Vash.
To a certain degree you are right.
But those okinawans did NOT claim to teach a Chinese MA, the same way Funakoshi did not claim to teach an okinawan art.
Certain aspects and insights will always be lost when an art is transplanted into a new surrounding, which will naturally differ depending on the new location/culture.
Simply look at the debates if asian MA are involved or not with religion.
Many japanese practice BOTH buddhist & shinto rituals and get married in a “christian” ceremony and it is not a problem or contradiction of either faith for them.
If you transplant a JMA into another setting call it kempo or similar to differentiate it from the source.
Example:
Shorinshi Kempo is bassically shaolin kungfu with “religious” & japanese trappings(Dogi, Ranks, etc). Why is it called a religion, because they can get a tax-break because of it. 
Is it Shaolin Kung Fu no not any longer, is it a JMA no it isn’t.
Japanese use “kempo” do identify arts that still acknowledge their chinese roots, many JMA used to be kempo-arts.
Hence, lets say Chen Tai Ji Quan is often refered to as Tai Kyoku Kempo, whereas Tai Kyoku Ken is often used to refer to “health” orientated or japanised flavours of Tai Ji Quan.
A friend of mine was told that his art qualified as Koryu art as they still taught the martial application, even though it was a Chinese MA.
Confused yet??
Even most japanese can’t understand it either as they have lost/forgotten a lot of traditions and roots.
As for not truly understanding an “art”, or similar.
I will NEVER understand what it means to be an American, the same way you will NEVER understand what it means to be british, muslim or whatever.
There are aspects to anything you cannot teach or learn, you can try to understand them but you will never truly know or be part of them.
You can live for 50 or 60 years in China and some aspects of chinese life and culture will always evade you.
Rant over.