I meant this part, from your post:
I posted info regarding my contentions straight from Encyclopedia Britannia: "After being repulsed by the Egyptians, they settled—possibly with Egypt’s permission—on the coastal plain of Palestine from Joppa (modern Tel Aviv–Yafo) southward to Gaza. The area contained the five cities (the Pentapolis) of the Philistine confederacy...
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That's an excerpt from Encyclopedia Brittanica's page on the Philistines.
Philistine
PEOPLE
WRITTEN BY:
Philistine, one of a people of Aegean origin who settled on the southern coast of
Palestine in the 12th century BCE, about the time of the arrival of the
Israelites....
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Biblically speaking, that implies they are descended from the Watchers of Genesis 6. The halfbreeds, if you will.