This is not a contradiction.

It is a reflection of the complexity of population history.

The founding of the Americas was not a single event with a single population.

It was the outcome of a long series of population movements, admixtures, and demographic events in northeastern Asia and Beringia over tens of thousands of years.

The founding population of the Americas — the ancestral group from which all Native Americans ultimately descend — was itself a genetic mosaic: primarily East Asian-related ancestry, with a significant component of ancient ancestry related to the Western Eurasian or Ancient North Eurasian lineages.

The Ancient North Siberians represent the earliest-dated expression of the kind of ancient northern ancestry that contributed to this mosaic.