Not vice-versa, oddly enough. I don't know if this is the norm for the fediverse, but on Lemmy, instance blocking goes one-way. So users on those instances can federate with Beehaw and see communities, posts, and comments, and even post their own stuff, but users on Beehaw won't see it.

Edit: Ah, correction, this only applies to things on instances that are still federated to the defederated instances. The two instances defederated from Beehaw will no longer get any updates directly from Beehaw, but will still see Beehaw users' comments on posts on other instances.