Thanks for posting that. It is interesting to see the changes from one generation to the next. One can also see the effect of some differing influences, such as CMC on Frank Choy's performance. These differences lead to the observation below.
The narration states that Choy Hak Pang learned the art directly from Yang Chenpo (aka Chenfu). Very often, people state the name of their teachers, particularly if their teachers are famous. It can be important to others to know where one learned one's art, but the implication is often that what one is doing is the same as their teacher. What rarely gets acknowledged is that the student is not the teacher. Many students perform what they learned quite differently from their teachers. There are a variety of reasons for that.
Since there is no known video footage of Yang Chenfu, it is interesting to compare students of his. For example, there are very obvious differences between CHP and, say, Fu Zhongwen.
https://www.youtube.com/watch?v=qBfrAlkDS0k There are clear differences between the two that go beyond personalization, body type, age, etc. Again, there can be a long list of reasons for that.
My point is simply a student is not their teacher. Having a teacher who has high-level skills is not a guarantee that students of that teacher also have high-level skills. Students often imply that they have high-level skills because they learned from someone who had high-level skills. It isn't uncommon for a teacher to do one thing and have students do something else, but have the students believing they are doing what the teacher is doing. The reasoning is often along the lines of, "Since I'm doing what my teacher is doing, and when my teacher does this he has good skills, I also have good skills".