It’s not a bat signal, likely the thread popped up into their “all” feed and a bunch see it at once.

Some of the stuff is because they were already a very established community with their own culture, who has only just recently federated with others. They are bringing their culture, which is full of memes and shitposting, out to where a good portion of normal Lemmy users don’t even know how to post a picture, and it is a lot all at once. It does seem that their admins want to have relatively good citizens, and it seems like most of what Blahaj really cares about is compatible (they are possibly even more extreme with caring about it). Being disruptive in political threads does not seem like a good reason to defederate an instance.