I don't think it's fair to categorize it as accelerationist, although definitely campism and critical support (that is, taking a side while remaining critical of it) - like you said, they know and despair that Russia is no longer socialist, they only side with the RF in this conflict as a 'lesser evil' than the dominant NATO camp. We saw the US prolong the proxy war (it's not their soldiers dying) until the they openly threw Ukraine away and negotiated terms with the RF when the war seemed no longer useful (this part usually happens more diplomatically and privately in a proxy war, but it usually happens).

If you want to argue with someone in good faith you should try to understand their position first, otherwise they will just see you as a reactionary and dismiss what you say.

Absolutely. The .ml instances are stricter than most and don't cater to anyone they perceive as ignorant and parroting propaganda in bad faith. From their point of view, it's just as simple as how most instances would ban conservatives coming in and starting bigoted, ignorant oft-debunked Fox News arguments about racism and transphobia. Why bother platforming it?