Their ideology demands that they pretend there is something mysterious about the location of the city of Ur; as I already explained in my video, the location of Ur is probably the most thoroughly established fact in the history of archaeology, the history of anthropology —or, simply, in the history of the world. It would be easier to come up with a new theory for the original location of London at this point (because there's been more research into ancient Mesopotamia than pre-Roman England!).