We need to nominate a dude to the mod team for the EXPRESS purpose of banning this weirdo's alts. I'm grateful to u/DomitiusofMassilia for popping in every few days, but sadly that's not frequent enough. We need a daily reader who can just hit "ban" when he's browsing comments. It won't solve the problem but it'll alleviate it.
We could also freeze new account creation and open it for select periods, announced with pinned posts. Our growth would be disrupted of course, but it's not like that matters that much.
I help to moderate ConPro, and we've dealt with the pedo pajeet for a while. It's actually not difficult to do. If the users actively report his comments, the mods can ban his accounts quicker than he can make them. It doesn't take a lot of effort, but it relies upon active users and mods, which is why this forum needs another mod(s).
Makes sense, we've needed another mod for a long time. Especially since Dom only shows up once a week or less.