A genocide can encompass an entire continent or a single metropolitan area. It can be primarily cultural or physical. It can encompass anything from government neglect in the face of famine to active killing squads. It can encompass basically any relative % of victims - "in whole or in part."
(And this gets even more ambiguous when we consider for example the fact that again, Gaza is basically a single metropolitan area of modest size, and yet the same terms & scale are applied as are applied to ethnic cleansing of much larger areas & much more concentrated paces of massacre!)
(Ultimately, when people demand people acknowledge "this is a genocide!" they are almost always saying " I'm seeing it all over my TL! DO SOMETHING ABOUT IT!" and there is a not-insignificant number of people who think that "something" should involve bullets and bombs in Tel Aviv.)
There are very few crimes in international humanitarian law MORE nebulous than genocide, by design. It doesn't even have legal gradiations! It's really mostly an additional condemnation of intent as far as I can tell.