This guy is clearly snooping the downvoters as an instance admin and retaliating against them. Wouldn’t even have noticed if I didn’t stumble onto the modlog in Voyager by accident.
I might be of course wrong in my assumption. But I don’t remember ever interacting with anyone from that instance, I’m not subscribed to those communities and the dates correlate.
I don’t even know, this is why I would say it’s a personal instance you have to either read his mind or know him already to be able to join.