The idea of expelling Arabs to other countries was once linked to Meir Kahane and other far-right radicals, and thus considered anathema by most Israelis. Now, to the delight of right-wingers, the idea is gaining traction as a ‘moral’ solution to the war.
It’s genocide in the same way the Armenian genocide is a genocide. When you forcibly move millions of people from one place to another a lot of them die. Think trail of tears.
Arguably, some ethnic cleansings are genocides too. But not all of them.