AFAIK, one of Lemmy's core developer seems to be a China/Russia apologist, see content on https://lemmy.ml/c/socialism , which is moderated by one of the creator: https://lemmy.ml/u/dessalines
He identify as a communist from his profile on GitHub and Lemmy. I am sure there are people (including me), who disagree with his definition of "communism" or "socialism".
As a left-leaning Chinese, who does not enjoy many decisions made by the CCP, it is obviously disheartening for me to see CCP being protraited as "socialists", "communists", or "democratic". But despite his potentially controversial political stance, it is very likely he is neither a neo-nazi (Nazi and Russia/China didn't have a good relationship) nor a white supremacists (even his cover art on Lemmy is a picture of Mao, and he allows China apologist comment on this subreddit).
I personally strongly oppose his political stance, but lemmy is a FOSS project maintained by many; so if the lead developer does something out-of-line, I am sure there exists people can maintain a fork.
EDIT: obviously, when I say "China" or "Russia", I refer to their current governments, not their people.