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.

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.

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