I get the idea of federation etc now in terms of the fediverse but when something is defederated does that just mean it’s not integrating with all the others/the one I am currently on?

Like I am on Lemmy.world and for arguments sake I can view posts etc on Lemmy.bullshit cos it’s federated. Then Lemmy.bullshit ends up being full of nutballs and Lemmy.world admins cut ties with them so I can no longer see their stuff from my instance and is now ‘defederated’, is that right?