People said much the same thing when Reagan spoke about the "evil empire" and other such comments.Sorry, you can't advance the peaceful settlement of a diplomatic problem by calling one of the two combatants "invented people."
Happily, we now know such people were wrong.
By that standard, the Kurds have a far greater justification to an independent Kurdistan. But to my knowledge no country actually supports the creation of such a country.Those "certain things" do not include justifying their historical existence as a people.
The claim isn't that Arabs residing in Palestine cannot develop feelings of being distinct from Arabs now known as Syrians, or Jordanians ect. The claim is that such feelings to develop into being 'Palestinians' has to go beyond their simple say so.By that standard, a majority of nations in the world with colonial pasts would have a tough time overcoming their colonial "invention."
Gingrich supports the two state solution; he supports an independent Palestine.
But Palestine, as per Gingrich, has to earn it.