The Soviets in WWII are not really an image you want to be compared to. They actually did commit multiple genocides in that era. Not against the Germans, I mean they did murder and rape a lot of people, but they were not motivated by the eradication of the German population. Those murders and rapes were “simply” war crimes.
So the battle of Berlin was not a genocide. Katyn and the Holodomor arguably were. Killing innocent civilians is “just” murder, a war crime. When Ben-Gvir speaks of fighting “human animals”, making Gaza a “slaughterhouse” and “erasing the Gaza Strip from the face of the earth”, that makes it into a genocide.
It’s the motivation, especially the explicit, professed motivation of the leadership that makes what Israel - and by the way, also Hamas, though less successfully - is doing genocide, not just “normal” war crimes.