That's what it seems like. Reading this article on the topic https://www.sciencemag.org/news/2021/03/earliest-south-american-migrants-had-australian-melanesian-

That's what it seems like. Reading this article on the topic https://www.sciencemag.org/news/2021/03/earliest-south-american-migrants-had-australian-melanesian-ancestry https://www.sciencemag.org/news/2021/03/earliest-south-ameri... and it says: "One unanswered question is why the Y signal hasn’t turned up in any North or Central American Indigenous groups. One possibility, Hünemeier suggests, is that the Y signal–bearing migrants simply stuck to the coast and made it to South America without leaving any genetic legacy up north" Ok. But how about "Or they arrived on the shores of South America by boat" ? I don't understand why that hypothesis seems to be avoided? It seems much more credible than "the people with that particular genetic legacy hugged the coast all the way down to So America and didn't mix with any other groups along the way."