I wouldn't be surprised if OP has blocked this user. A lot of people have or just avoid engaging this person. Unpleasant interactions with this user is a known thing.
You're probably right that OP has blocked this person (every sane comment has downvotes except in this chain!), but "unpleasant interactions?" I'm having unpleasant interactions with OP right now (I have put it on hold until they solve the multiple choice question above, though) and that individual sure can't stop posting. Since I remain clearly unblocked, I have to conclude that OP blocked this person for some reason other than "unpleasant interactions." Anyway if OP is curious about stuff they can't see due to choosing to not see it, OP can log out of the account that's choosing to not see the stuff.
I'm being polite when I say unpleasant. Let's just say this user has a reputation, and not a good one. A lot of .world admins are very strict with personal attacks, even when its calling out a pattern so I'll just leave it at that.
I don't think not endorsing is the same as saying vote for someone else. I won't endorse McDonald's but if I'm starving with no other option I would have to eat it.