Is it true that native Americans are a mixture of Africans that came over at least 56000 years ago and Asians that came 12000 years ago there's this guy named Dr David Imhotep who claims that?

The claim made by Dr. David Imhotep that Native Americans are primarily a mixture of ancient Africans and Asians is not widely supported by mainstream Archaeology or genetics. Current evidence suggests that Native Americans primarily descended from East Asian populations who migrated across the Bering Land Bridge around 15,000 years ago. While there is some evidence of contact between Africa and the Americas before Columbus, it does not substantiate the claim of a significant ancient African influence on Native American ancestry. Overall, the prevailing view is that Native Americans have distinct genetic roots primarily linked to their Asian ancestors.