The population Y signal in the DNA could, in this interpretation, be related to the same ancestral diversity that produces the morphological similarity.

This interpretation is not established fact; it is a plausible connection between two different lines of evidence.

The morphological similarity between Lagoa Santa skulls and Australian and African skulls has been documented for a long time.

The Population Y signal in Lagoa Santa-related genomes has been documented more recently.

Whether these two observations reflect the same underlying cause — some form of shared deep ancestry — or whether they are coincidentally related is a question that the current evidence cannot definitively answer.

What the juxtaposition of the morphological and genetic evidence does suggest is that the Lagoa Santa population was, in some sense, genetically distinctive in ways that had morphological consequences — that the founding Native American population was not perfectly genetically uniform, and that different founding lineages may have had different morphological characteristics as well as different specific genetic profiles.