His rehashing of Golda Meyerson's claim that the Palestinians did not exist as a separate people in 1948 ignores the fact that nations and states are two different things. There was no Israeli state before 1948 either. Indeed a much better argument could be made that there was not an Israeli nation before 1948 then the claim that there were not a Palestinian nation. Being under Ottoman rule from 1516 to 1918 does not negate the development of Palestinian nationalism in the 19th and 20th centuries during the same time that nationalism developed in most of Europe including Jewish nationalism. One might as well claim there is no such thing as a Czech nation because they were under Austrian rule until after World War One.
It is a bit late in the day for Israel's supporters to be attempting to erase the native population of Palestine from popular discourse. There is a collective national entity whose members call themselves Palestinians. They are the people who were living in the territory that became the British Mandate of Palestine when the Ottoman Empire collapsed. Their continual presence in this territory predates that first Jewish Aliyah from Europe to Palestine by many centuries. As such their moral claims to the land are far stronger than the European colonists that started settling in the territory in the 1880s, much later than the settlement of South Africa, North America or even Australia.