Oh, you might be interested to know that lemmy.ml and lemmygrad.ml are also federating with the lolicon one, which appears to be a Mastodon instance. Both of those have blocked the exploding-heads one, though. This is probably also due to the default open federation policy. You could talk with the instance admins about it.
It's pretty cool that federation (& blocking) information is public! In any event, there's no point in "repeating what you heard about", which is to say "playing Telephone with speculations", when we can all just see the facts:
https://lemmy.world/instances
https://lemmy.ml/instances
https://lemmygrad.ml/instances