Occupation requires you to own land prior to that Empire, and no Palestinian has ever laid claim to their own territory without that territory belonging to someone else, throughout all of human history.

Before the Ottoman Empire was a mix of caliphates and crusaders. Before that was the Roman empire. Before that was the Persian Empire, before that was the Egyptian Empire and before that it was Israel/Judah.

I skipped a couple of minor empires, but it's pretty much a chain of "someone's" forever, and that "someone" has never referred to themselves as Palestinian prior to the mid-20th century.