I was wondering why do I only see a single post and no comments for that user, but it looks they were banned on my instance.

since I came from reddit in the first wave, I have read others observations multiple times that lemmy.world has bad moderation, in several ways, and not only because they don’t have the capacity for their large server but some other reasons.
you said you had enough for now, but if you come back later, try an account on my instance, slrpnk.net or some others like these that are smaller but not too small. maybe you would like it more. I don’t say lemmy.world was a bad choice, I think still better than reddit in recent years, but you get the idea.
but that this user you linked has been banned for almost 2 years by now on my instance makes it look like that it’s indeed moderated better.

instances have a lot of moderation power, to make the experience with them better or worse, by choosing which users or sometimes complete instances to ban, so that’s a reason other instances could feel different

(and then there’s the regular examples like this, which are not slop but are heavily disputed/recontextualized by the top comment. Correction highly upvoted, yet the OP itself is still doing well))

what was the post? I can’t load it now, maybe it was deleted.

honestly the thing I hate the most about lemmy is that deleted posts just give an error that’s more generic than anything microsoft windows could show, and that deleted posts make all the comments inaccessible too.