I'm also not clear how the use of Hyksos-style chariots by Ramesses II's is linked. The Hyksos rulers in Egypt were a couple of centuries earlier, right?
Anyhow, can you shed any light on the "the elite attendant to the rulers" and the "ethnic group with which they are associated" mentioned in the paper?
I think it was this same documentary that theorized a small number of escaped slaves from Egypt wandered through Midian and into Canaan. The documentary identified a minor city-state in/near Midian that's documented to have worshipped a god named Yahu, and theorized that these wanderers had some kind of dramatic religious experience there, which later mutated into Yahweh worship. The documentary further theorized that this small group of actual escaped slaves were adopted by, and became the leaders of, the nascent Israelite communities, accounting for the Egyptian slavery narrative.
The documentary didn't mention that Canaan was an Egyptian vassal state from the 18th to 13th centuries B.C.E. If the Israelites originated from Philistine slave / lower class uprisings, I wonder if the oral history of the Egyptian vassal state period is the origin for the narrative of being slaves in Egypt despite there being no archaeological evidence of a massive-scale slave escape from Egypt. Being a slave in a state that's essentially a slave of Egypt probably feels like being doubly a slave to Egypt. To me, this sounds more likely than a small number of Egyptian slaves being adopted by local tribes and their narrative becoming the tribal narrative.