I'm not sure this qualifies as censorship. There are a bunch of posts and comments that get flagged and unfairly downvoted for no apparent good reason, yes. It might depend on the mood of the users with voting power on that day, and that's unfair, yes. But from what I've seen there is no central agenda to systematically filter out topics or people. Subjectively, I find HN to be much less judgemental than Twitter (musk or not) and other places.
That's a completely fair point. But I suppose that regardless of whether it technically qualifies as censorship, it's people removing content that bothers them, and the end result can still be the same.