"The short version is that eligible people and works were kept off the Hugo ballot, not because the Chinese government or the Chinese principals of the Chengdu Worldcon overtly demanded it, but because American and Canadian Hugo administrators made the censorship decisions themselves, often on grounds that were (to put it politely) misinformed."

The author himself is misinformed heavily. I worked a senior management level in China for an internet company until a few years ago (pre-COVID). There is no overt demand from the Government to censor or a list of what to censor, you are suppose to do the proper thing. If you don't then you get penalized.