It was wrong.

The Solutrean hypothesis was a simple story — Ice Age Europeans had crossed the Atlantic and been the first Americans.

It was not supported by the evidence.

The two-population model was a simple story — two distinct groups, with different morphological profiles, had settled the Americas in sequence.

The ancient DNA evidence showed it was more complicated than that.

Population Y is, in its way, a warning against simple stories about complex processes.

The ancestral history of any human population is never a straight line from a single point of origin to the present.