I mean, kinda? They’re also heavily descended from 7th Century AD Arabic conquerors, but yes, many other natives may have adopted Arabic culture, language and religion at that time.
But Jewish culture is also derived from the Canaanite culture, with arguably more overlap. Jewish culture in the region can be traced back to at least the 9th Century BC, with the literal Kingdom of Israel. So the argument of “Well who was there first?” does not necessarily favor the Palestinians over the Israelis.
This has always been happening though. It’s not like the Ottomans took over the region peacefully. It’s been conquered and re-conquered by Babylonians, Egyptians, Greeks, Romans…
Why should they not? They posted an inquiry, looking for advice. That is their reason for posting.
They do not owe personal information beyond what is required to answer the question. And typically, with regards to anything resembling a legal matter, the less information posted publicly, the better.