It makes no sense to say a government censored it. It makes the Historical British Empire look evil. The UK is certainly not controlling the Hugos. It criticizes the Chinese CCP zero, because they are not mentioned. It shows great evils that were done TO China in the past by colonial powers, which should be a positive from the CCP perspective. The Hugos certainly have not been snubbing Chinese authors (see award winner Liu Cixin), and therefore the USA has not stopped them. I mean, Liu Cixin shows us that the revolution in China could have traumatized some people, yet it won.

EDIT to add: Now, I've just seen a post over on Reddit that actually explains what people think are going on with the Hugos this year. This post didn't explain that at all. I still can't see any logic behind this supposed censorship, but it's nice to have context. For anyone else who doesn't follow World Con Politics: https://old.reddit.com/r/Fantasy/comments/19ctcmn/im_a_bit_surprised_by_the_relatively_subdued/