"Quite literally as bad as the Nazis" is a bit hyperbolic.
Not at all defending their stance at all. It's just that being as bad as the Nazis is a really high bar, and by being that bombastic you risk distancing people who might otherwise be open to your arguments.
I personally don't think the term fascism is applicable either, but that's being pedantic. You don't need to be fascist to be awful - you just need to be awful to be a fascist.
Assuming they are indeed denying or in favour of the Uyghur genocide (i never saw the original post, but I'm assuming it's true), that is really everything anyone should need to know.