This, it’s a server specific patch, give the devs some time to update it and it should probably be back
https://join-lemmy.org/docs/users/04-moderation.html
from the documentation there is a way to ban a user from the site, but only admins have access to it, might be worth trying to coordinate with them to ban them
to add to this, youtube has the ability to be watched with the NSFW UI patch on lemmyNSFW (one of the added expand features [shows on the site as a book] before the update to 18.1)