That's legit. The UN report clearly found that people from the Hamas side of the fighting had committed widespread sexual assaults. Bringing up misleading talking points and blog posts to try to spin it around into the report finding the opposite is textbook misinformation.
I actually don't agree with banning people for this type of misinformation, I think arguing back in kind is the right way in most cases. But if you're going to ban misinformation (which most of Lemmy seems to think is okay), then this is a pretty reasonable ban.
(It's probably offtopic to get into an extended argument about the original Hamas sexual assault claims under this post... if anyone wants to re-inaugurate my whole "debatebro" community by having it out with me there about it though let me know and I'm down a little later today.)