There does not seem to be any historicity to the biblical tale that the Jewish people existed somewhere else and then migrated en masse into the region from elsewhere.

So is the Exodus not historically true as it is written? Deliverance from slavery (presumably in Goshen) in Egypt not true?

Yet it is apparently taken as indisputable truth that Yahweh allocated Israel as The Promised Land and that's the land that is taken to be their indigenous home. Which would have happened after living in Goshen in Egypt for hundreds of years prior to that.

The bible seems to say that both things happened (Exodus from Goshen/Egypt and the "giving" of The Promised Land), but only the later is now taken as fact?

PS - I find the whole notion of an indigenous land to be a foreign concept. As a 3rd (or 4th?) generation immigrant American with great grandparents hailing from Ireland, England and Germany, I make no claim to any indigenous land and wouldn't care if I was transplanted elsewhere as long as I could have the same standard of living!