Like so many "Catholic positions" this one is a farce and a fraud. It uses 3 paragraphs for a simple presentation of elementery ancient history concluding with the Lost Tribes being assimilated, of course. Then it goes on for another 20 paragraphs bashing British Israelism in general and a Herbert W. Armstrong in general. A classic case of bait and switch! No one on this thread brought up British Israelism until this post, but that was the Catholic churchs sneaky agenda all along.
I think the Catholic church, the Protestant church, and the Jewish churches all have a lot to lose if the real Lost Tribes are discovered to be Biblically alive and identifyable as it describes them. As joint champions of the status-quo including the flat earth and centre of the universe, they are certainly not to trusted with this sort of history. This post and link demonstrate again that they are not the solution, but a goodly part of the problem.