No. There was no defederation.

lemmy.world/instances is the public list of which foreign instances are federated with or blocked. LemmyWorld is federated with dbzer0 still.

Lemmy.world did ban several priracy-related communities from multiple foreign instances and that were hosted directly on Lemmy.World, and you can see that activity in LemmyWorld’s public modlog here: lemmy.world/modlog . Hint (filter by action = “removing communities”).