From what I understand :

The sea people’s invaded Egypt during the Bronze Age collapse and one of the tribes of Sea People’s were called the PLST. They were relocated in the Levant . This happened around the 1200s BC.

There are phillistines references in the Jewish Bible and they are Israel’s neighbor and engage in various wars with them. The OT stories are dated to around starting at the 10th century BC.

The Greeks conquered this land around Alexander’s time in the 4th century BC and called it Palestine and since then Palestine has essentially been conquered by various different empires (Rome, ottomans, British etc).

There is archeological and genetic evidence that the phiillistines originated from Europe and populated the Levant in 1200s BC. This lines up with when the ruler of Egypt relocated the PLST to the area as well. It’s theorized that the sea people’s were various tribes from Europe.

So were the PLST the phillistines who became Palestinians ?