The problem is and what we're seeing is one its down to interpretation, two Wickerman is also being extremely selective and entertaining his selectivity is allowing him to sidestep the evidence, three the physical evidence, DNA, Pottery, Weapons, Scriptures from Hebrews and depictions of them in Greek style by the Egyptians.
Maybe it is necessary to make something clear, we do not know for a fact truly what happened in the 8th year of Ramesses III, but according to the Egyptian texts Egypt came out the winner.
We can always call him a liar, a good many scholars have for decades, these pharaohs certainly embellished their campaigns, and I've little doubt Ramesses II did not fair so well at Kadesh, as he claimed in his records at home.
However, If we are going to judge what Ramesses III wrote about his Asiatic Wars then we must take his records verbatim, unless we can find tangible cause to do otherwise.
First - Ramesses III claims to have been invaded and he repulsed all of them, with the exception of the Sherden & Wesesh whom he took captive back to Egypt. He
never claimed to take any Philistines (Peleset) captive, or settle them anywhere.
Second - archaeology has established that following this "Sea People" invasion, Egypt dominated the coastal Levant all the way north to the Yarkon for the duration of the reign of Ram. III, and through to Ram. VI. (This is the last Pharaoh known to control Megiddo), an approximate time span of 35-50 years, or two generations.
Several south Levantine sites destroyed at the end of the Bronze Age are covered by windblown sand, a fact which extremely troubled Trude Dothan because this does not fit her theory that the Philistines invaded and directly settled in the Pentapolis - archaeology shows it never happened.
Third - to date, no Monochrome pottery (MYC IIIc.1b) has been found in a secure strata dated to the 20th Dynasty. This pottery, when it does appear, is dated to the 21st Dynasty and is within a generation or so followed by the Bichrome pottery (this, according to Finkelstein).
The people who made this Monochrome/Bichrome pottery only moved in to the Levant
after Egypt relinquished their firm hold on the southern Levant.
So, where does this DNA evidence of "ancestral SE European" fit in?
If the Philistines were not living there
directly after the invasion, then who's DNA is it?
The only pottery found above the devastated sites is Egyptian & Canaanite, no Mycenaean, no Cypriot, no Monochrome & no Bichrome. Only Canaanites & Egyptians were occupying the southern Levant for roughly 35-50 years, until the end of the 20th Dynasty.
Obviously then, this DNA can only belong to the people who came in to the region in the 21st Dynasty, those who made the pottery. The DNA can only apply to some foreign immigrants who came 35-50 years
after the invasion.
Now, you can disagree with anything you like there, but "this" is the evidence.