It is no secret that the Chinese government has gone at great lengths to rewrite ethnic history to collectivize Chinese identity. Also, considering what is going on with the Uighurs, I wouldn't be surprised if it was an issue CA is concerned about.
Just some things to chew on here -
https://www.e-ir.info/2010/01/10/the...ic-minorities/
http://www.bbc.com/culture/story/201...its-minorities
https://www.axios.com/china-communis...bd1d99bfb.html
https://thediplomat.com/2018/08/the-...hnic-identity/
https://case.edu/affil/tibet/moreTib...relations2.pdf
I don't want to stray too far either, but let's not ignore how sensitive the Chinese market is, especially when it comes to depicting things like this.