Uhhhhhh no it's not. There is nothing about believing that Israel is committing a genocide against the Palestinian people (they are) that prevents someone from simultaneously believing that the holocaust happened and was just as bad as is commonly understood (it did and it was).
It's like saying that accusing me of being a thief is denying that time I was robbed.
Ohhhhh so you literally mean that people who use shopping carts are in relationships where their SO is having sex with someone else behind their backs?
Right. Of course that's what you meant. Well obviously that would be a MUCH more normal thing to believe.