Really good video, especially like the comments about CR providing opportunities for people to test out their art!
As usual with a place like China it is really difficult to generalise or reach one conclusion because of the sheer diversity and size. Certainly the old story that proper TMA had died out on the mainland is wrong, lots of TCMA are alive and well in the mainland today.
I would say when it comes to taiji teachers the CR was bad for them, and several of the famous ones did suffer. For example, Wang Peisheng was sent down to the Yunnan countryside, Chen Xiaowang's father committed suicide by jumping into a well, and Cui Yishi (Yang Chengfu's disciple) was made to kneel on iron bars in the courtyard of his house by red guards. Also Zheng Jun (son of Zheng Wuqing, Zhaobao taiji master) had red guards posted outside his house to stop him practicing taiji.
Also even in Shanghai the xingyi teacher Liu Molin (Hebei style) had his hair cut into a 'Yinyang' hairstyle and then was beaten up while his hands were bound. Unable to take this kind of humiliation, he killed himself by jumping in the Huangpu river.
So I would be careful about downplaying the damage it did to TCMA and TCMA teachers. I think the bigger the city and the more famous the teacher, the more likely they would have been to suffer.