Whether they did or not you raise a great point that it would simply be that easy
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So here are public databases they could have compared to, they're smaller and usually focused on specific markers e.g. Y chromosome. But would raise fewer ethical issues and be a easier practical route (if yes likely to work)
My guess is Y-STR typing + one of the publicly searchable services here: https://isogg.org/wiki/DNA_databases#Y-DNA_databases …
