After decades of being on the fringe, you would think this moves me inside the sanity circle now. But you'd be wrong.
I believe in an even more radical theory - that the Solutreans/Clovis people were Neanderthals escaping genocide in Europe. This means that Neanderthals had survived long after historians believed they had perished.
You will hear anthropologists discuss the "remarkable robustness" of the Clovis people, including their thick bones and powerful ligaments ... but they cannot admit they were Neanderthals when it is so obvious they were. Amongst other things they were slightly taller than modern people which is forbidden to associate with Neanderthals because it might then lead one to learn about the Amud.
Obviously, Europeans have dominated the planet for at least 50,000+ years. They are not the "newcomers" anywhere. It is everybody else who is kind of a spinoff of varying degrees, not the other way around.
Incidentally, before the culture wars started shortly after Kennedy was assassinated in 1963, this theory was called "diffusion" and it had been widely held for over 200 years or more. This was also the year I was born. It became politically forbidden to speak of shortly thereafter like the bulk of all serious science and inquiry.