Watched the trailer. It's isekai. Very poorly thought out isekai, since even though black people rule the world, all the clothes, weapons, etc. are lifted straight from the civil war/cowboy movie props department- the only way this could really make sense is if our neo-Nazi protagonist is actually dead and this is his hell/purgatory.
This might be worth a hate-watch (after finding a totally legitimate copy floating on the high seas of course) just to see how tone-deaf and sadistic it is. If you'd written this story twenty years ago (as Steven Barnes did, more or less) then the overarching theme would be how evil is evil, and develops in predictable ways no matter it's cosmetic features; white, black, it's all the same from a spiritual standpoint, because we're all human underneath. It's [the current year], though, so they're going to try and have it both ways by making the main character irredeemable for being white while being put through the wringer for it. If the creators are bad enough at making him unsympathetic (which they might well be, since they're not going to consider the possibility of a white supREEEEEEmacist being sympathetic) it could develop a semi-ironic right-wing following, Man in the High Castle-style.
