"They're not killing them fast enough" does not make it not genocide.
I also think it's a bit odd to argue about the definition of the word. During this last escalation, Israel's government has killed over 42,000 Palestinians, including almost 17,000 children, and injured about 100'000 people in Gaza. Even if you come to the conclusion that this does not technically qualify as a genocide, that doesn't help any of the people living in Gaza. It doesn't help the Israelis, either, most of whom would probably prefer to live in peace.
It seems callous and pointless to look at what is currently happening and take that as an opportunity to start arguing about the definition of a word.