Lemmy is developed by two (2) people and asking for one of them to leave is effectively just killing the project. If you don't like it, you can move to an alternative such as PieFed.

Personally, I can't make myself care about this too much. It's a doshit take (somewhat understandable considering the guy's background), but it was publicised over a year ago, he hasn't said this sort of crap since then*, and Dessalines' whiteknighting for Russia is IMO way more of an issue morally and politically. But at the end of the day the question is whether Lemmy works fine for you or not and whether the admins' opinions harm your experience. I don't think they do, Dessalines bans criticism on his turf but it's just a handful of communities, while the devs are still providing the infrastructure for diametrically opposed views and communities.

*edit 5 days later: apparently he has posted this quasi-apology in the meantime

[–] froufox@lemmy.blahaj.zone 4 points 1 week ago

That's a common situation with open source software. It doesn't belong to anyone basically. And as long as it doesn't inherently bring something malicious as a technology (and Lemmy doesn't), I don't care. By the way, there's another major contributor to Lemmy, who is a Catholic... I also did (doing) minor contributions. I'm pro-Ukraine and non-binary. And there are hundreds of contributors in the repo who are probably of very different political views