That’s meaningless because it includes Jews and arabs and christians who lived in Levant.Atleast as early as 1920 when the entire region was called Mandatory Palestine.
The first written records referring to Palestine emerged in the 12th-century BCE Twentieth Dynasty of Egypt, which used the term Peleset for a neighboring people or land.![]()
Mandatory Palestine - Wikipedia
en.wikipedia.org
![]()
Palestine (region) - Wikipedia
en.wikipedia.org
The issue is when Palestinian arabs become different from other arabs?