Arabs who moved to Eretz Yisrael (known in English as “Palestine”) didn’t magically become indigenous just because they started calling themselves “Palestinians” in 1968.
“Canaan, Palestine or the Holy Land &c. Divided into the Twelve Tribes of Israel”
Decades of propaganda to make people forget that the terms weren’t in conflict until an Egyptian terrorist named Yasser Arafat made it up in 1964.