Maybe it could be addressed with cryptographically-signed votes
That is how it works, I believe. Each vote has to be signed by the actor of the user that voted.
There have been people who did transparent vote-stuffing by creating fake accounts en masse and get detected, because they were using random strings of letters for the usernames. Probably it's happened more subtly than that and not been detected sometimes, too, but it's not quite as simple as just reporting a high number.
"This magazine is not receiving updates" is why it's out of sync. It's no different than a Lemmy instance which isn't syncing updates from a community. You'll be able to see the community, and sometimes see some content on it, but it'll be missing most of the votes. Also, when you first subscribe to a community, you'll get a handful of recent posts, but none of the votes, so you'll see content with the voting all wrong.
Mbin might also be flaky about syncing with Lemmy instances, but that's not the reason in this case that the votes are out of sync.
I looked over the votes for a couple of the posts in !world@quokk.au. I've seen voting in that past that seemed faked, but nothing in this community jumped out at me.
As much as I'm in favor of a !world community that isn't on lemmy.world, because there's clearly some kind of rot going on there, I'm not sure how good an idea it is to have someone who's habitually gotten their own stuff banned in the past be the boss of a new community. He didn't get banned for tangling with the mods, he got banned for advocating violence, abusing the report feature, and things like that.
Of course, diversity is good, obviously. Let's see what he does with it.