If they leave so much of a group alone, it starts to suggest that the intended targeted group is a different, smaller one. In this case, residents of Gaza vs Palestinians as a nation. Especially in combination with the "siege" comments, the motive seems clearly military advantage.

They’re forcibly mass starving people. That’s genocide. There are military objectives, sure. It’s still genocide.

By this measure, the Armenians were also not the subject of a genocide. Which of course, is the common opinion in Turkey, and almost no where else.