Sure he can, and I'm looking at it, though at first glance it appears to just be DNA Haplogroups, which do a poor job of giving a coherent definition of "caucasian" and a worse job of qualifying as a subspecies.
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Haplogroups don't map to subspecies, and calling it a "flexible taxonomic heuristic" is just hand-waving.
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Haplogroups are subspecies, period.
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... "Yes, there are comparatively isolated human populations, with distinctive genetic characteristics, but we're not going to call them 'races' because that would be to stop despising our great grandparents."
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