It'll be a borderline expos on any selection of internal corruption/coercion/authoritarianism/minority oppression/social surveillance/etc issue going on in China. Do you really need the actual film? It doesn't particularly matter.

You surpress the 95% of discussion globally, outside of your own borders too, and the issues aren't really issues any more.

Edit: it's about Uyghurs control/genocide/oppression/other description for clarity. There are a lot of articles/stories on the topic if you were after info.