I think not much value would be lost by defederating.
They are denying genocides, they are supporting regimes which are not compatible with LGBT+, they don’t discuss in good faith, there is a lot of whataboutism. They want to dunk people and be right and not have their view challenged.
Unfortunately they have so radical ideas about it all (mostly US centric whataboutism as far as I can tell). They fall into fascist/authoritarian traps where they can’t even recognize they are fighting against people like me or us. They dehumanize people.
I don’t think their views are compatible with LGBT+ spaces and values even though they claim to be one while cheering for the people who would remove them from existence the first chance they would get.
Some people are moderate over there and that were the only pleasant interactions I had with them. I can’t tell if the radicals are a loud minority or the majority. They poison the well though.
Even after all that said I don’t know if defederation is the right choice. I mean they provide some good content and in the end they are a big community. On the other hand I have already blocked the instance using the Connect app and my experience improved a lot.
I think in summary they create a hostile space for all people. Even left leaning people are not safe due to their radicalized views and it is exhausting to have every thread derailed with some unrelated rant by them.