Are they whining about being blocked? I didn't catch it in the article, but maybe I missed it?

The only thing I saw was kind of the opposite of whining: "FSE being fedi's equivalent of a dive bar, I understand people on "gated community" instances not wanting to deal with it"

They seem totally fine & understanding if people want to block them. They just don't want the block reason to be a lie (e.g. saying they allow loli stuff when they don't). Presumably, you saying they are a bunch of assholes as your reason for blocking them would be completely accepted by them.