Let's ignore the irony for a second of these leftists using the Bible to support the Palestinians (when usually the Bible is mocked as a collection of "fairy tales").
The Palestinians call themselves Arabs. Their national covenant declares that Palestinians are Arabs. They are part of the Arab League. Hamas itself admitted the Palestinians are from Egypt and Saudi Arabia.
But these HPers know better than the Palestinians themselves what the Palestinians are, because the HPers are smarter and better than the Palestinians. Those stupid Palestinians, thinking themselves to be Arabs!
It would certainly be convenient for the anti-Zionist cause if the Palestinians were actually descendants of the Canaanites. But unfortunately, reality keeps getting in the way.