The Ashkelon DNA evidence adds another layer to this complexity.

The Philistines who settled on the Levantine coast and built their cities there were people with Aegean biological heritage who adapted to a new environment, learned new languages (or brought their own that eventually gave way to local languages), traded with and married the people around them, and over the course of generations became part of the broader cultural world of the Levant.

Migration does this.

It always has.