Why of course that is pure bullshit, unless you can provide a link.Palestinians did not have a unique language, religion, culture, history, etc., to identify them as a people. Everything that would identify them as unique they share with the arab states around them.
Palestinians were of mixed religion though predominantly islam, spoke arabic of a southern levantine dialect (more egyptian and bedouin), had not history or being a united people with a history of an nation.
Simply living in a place for at least two years does not make one part of a nation or unique people.
Migrants, transients, nomads, seasonal workers does not make one a native people of the land you work.
Nearly half the palestinians were given that identity from the mandate by chance when the mandate ended. It was not possible to separate and repatriate half the arab population, so they all got lumped together as palestinians.
Again this simply denies Palestinian nationalism which is nonsense, 50 years before Zionism (when Jews numbered barely 3% and called themselves Palestinian) the Ottomans had to put down a separatist Palestinian national movement.
Palestians (including a tiny proportion who were Jews) lived in Palestine for near two milllenium and to suggest tehy were not a nation with nationalist ideology is pure fantasy.