Based on the reconstruction of the Philistine language coupled with pottery - they were more than likely Hellenes or a group of refugees of many different origins but with a major Hellene element.
Since the Philistines seem to appear at the same time as the Sea Peoples-—and with the knowledge of iron making—wouldn’t they be a good candidate for being a part of the Sea Peoples.
Isn’t it too early for Hellenic? Or are you suggesting they were Myceneans? hmmm... possible - as the Myceneans seem more war-like than the Minoans