I suppose we'll never figure that out, because his domain is gone. Little bit cynical and circular isn't it, cull the 100 follower people, who will care, they only got 100 followers!
And if this was a coordinated deplatforming, who knows how many properties of theirs went down simultaneously, including cache from various search engines. E.g. If they used their Gmail account for emails to all those services mentioned up in the thread. Your email is your identity and it's not owned by you atm.