Not just accounts, communities. He was managing a few communities he'd migrated over to piefed who would continue to be affected by that limit even if he switched account, essentially shadowbanning his votes at some point.

Moving a community means hoping that enough regulars see the notification to "jumpstart" the new community to the point the new posts show up in /all for the rest of the old community to pick up on it and realise they're not subscribed. You'll also need to keep reminding people posting in the old community to post to the new one instead for a while.

It's kinda founding a new community for a topic that already has an established community, then trying to get that established one to join your new one.

That's a lot of effort I can see him no longer wanting to do.