Personally, this is the first time I've ever heard Norse mythology being tied into the ancient Hebrew text. I've heard a lot but clearly not everything, and I have no interest in all of the crazy. I'm tired of dealing with all of the crazy I've had to deal with up to now
Similarly, anyone claiming descent from King David is indeed claiming that the he was a real historical figure, but we don't need to accept their claim.
As for tracing Odin's lineage back to the Hebrew patriarchs, that is of course a form of syncretism, where people who believe in multiple religions create a mix of them for various purposes.