I don’t think the Philistines have any relation to the modern Palestinian population.
No clue if they’re genetically the same people, but it’s not really important. That region has been recognized as Palestine for a long time. Any argument about statehood is just Eurocentric justification to steal land from the natives.
I believe they were all killed at the end of the Bronze Age by the Sea People. Or maybe they were the Sea People. 🤷♂️