I'm not a geneticist and so I'm not qualified to judge whether your arguments regarding the uniqueness of Native Americans are valid or not. What I do want to question, however, is the way that a common Homo Sapiens ancestry from Africa serves any "white-centric" narrative. A common human ancestry from Africa has always been a proof against any idea of white supremacy, as far as I'm concerned. Furthermore, genetics is only one piece of the puzzle. Are there indications that there were humans in the Americas more than 33,000 years ago? More importantly, is there evidence of older hominids that would have evolved separately and is it even possible that a parallel evolution would lead to another Homo Sapiens species? I think that it's actually not even remotely likely that such a thing could happen.