They don't ban anyone denying Palestinian genocide despite it having literally infinitely more evidence than Xinjiang where not even one single death is confirmable in a far larger land mass where nearly 100% of the population have smartphones.

The only thing you can take from that is that genocide denial is not the real reason this person was banned, but instead holding a position that is contrary to the lemmyworld worldnews modteam. They hold the position that Xinjiang's ""genocide"" is real and you're not allowed to deny it. They do not hold the position that Palestinian genocide is real, therefore denying it is 100% ok.

It's a US supremacist way of moderating. Denying the genocides that the US has labelled as genocides (even though it's officially backtracked on that) is not allowed. Denying the genocides that the US denies however is completely allowed. They probably aren't even self-aware that this is the way they're moderating, they just think it's normal, it's background american supremacism baked into their behaviour and normalised in their lifestyles. They probably haven't even ever thought about the contradiction.