I have no idea what the views of the person in the article are, but the Idea of a supposedly federated platform like blusky banning people is a bit ridiculous

This take is ridiculous, more like.

The whole point of federation is that each provider is responsible for moderation on their own service. Bluesky is indeed running a service, not just writing the AT Protocol specification. It shouldn't be controversial to boot people who have explicitly said they're there to promote bigotry.

And, because federation, then those bigots can make their own instance, right? Sure, and the Bluesky instance and everyone else should then defederate that instance due to harassment.

That's how federation works.