The story of Arlington Springs Man is explicitly not a DNA story.

DNA preservation in warm, seasonally wet California sediments is poor, and no genetic material has been recovered from or associated with the Arlington Springs femora.

This means there is no genomic information about the biological population to which this individual belonged, no assessment of genetic connections to later peoples, no molecular ancestry data of any kind.

The science of the site is stratigraphic, geochronological, and bone-protein chemistry — not genetics.

There is no evidence of what this person ate, beyond the general inference that people on a resource-rich island with access to both marine and terrestrial foods would have used those resources.