Interesting experiment. No new info here but its good to see this experiment to vividly illustrate the loss of information within a chain of “transmission”.
Moral – If you do not learn an art carefully the entire art can change even within a few short generations!
More so, when instructors teach assistant instructors who in turn teach senior students who are in turn tasked to teach junior students. This is why if a teacher wants to really transmit an art he would teach personally rather than rely on an intermediary instructor.
Now you know why the quality of Tai Chi that is taught in a group class is largely of poor quality.
I won’t even need to mention the other point here is that any master or school who claims to have unbroken, unchanged teaching all the way from the founder is either delusional or a liar!