Fair enough. Suggest you get a copy of the book on the Assyrian Tablets in the British Museum. A link is at my Profile.
It sets out the case in a very solid but readible way. These original Assyrian records have much to say about the Northern Kingdom while it was captive there, and where it went from Assyria. (HINT: They were not "assimilated".) Give it a fair trial and I think you be impressed with the evidence.
(Click on my Profile for details.)