Wrong. There were no Philistines in that period, a Greek sea people not related to modern Palestinians. There were Jews, their cousins the Samaritans and the Romans. The Romans renamed Judea to Palestine, their word for the long gone Philistine enemy of the Jews, pretty much as a way of erasing Jewsih identity there after two revolts by Jews in 50 years. They even renamed Jerusalem but it didn't stick. After this period Jews mostly dispersed under the yoke of Romans and later Byzantines but there were no other people in that land, just a residual population of Jews and Samaritans who remained- much like when the Assyrians and Babylonians before had scattered or carried off part of the population.

But NONE of this has anything to do with what I was saying, which was a distinct national identity of Palestinians made up of Arabs in the regions did not exist prior to the 1960s. A geographical place name of a territory does not make a people on its own, Zionist Jews were known as Palestinians prior to 1948 when it fell out of favour, the formation of the PLO in 1964 was the end of pan-arabism where Palestinians saw themselves as part of a greater Arab people with Egypt and Syria briefly one county, the United Arab Republic(UAR). The definition of who was a Palestinian was only defined by the PLO in 1968.