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The researchers found that mutations in the DNA indicated a group of their direct ancestors from Siberia was likely isolated for at least several thousand years in the region of the Bering Land Bridge, the now-submerged plain that lies between northeast Asia and Alaska once exposed by a significantly lower sea level.

This is statistical nonsense. Data could show that a group was genetically isolated in a small region for 5,000 years, but data cannot distinguish between genetic isolation on a land bridge, genetic isolation in some Asian terrain (whether due to ice, mountains, or culture), or genetic isolation in a North American outpost before spreading out throughout North America. The fact of extended genetic isolation is interesting, but the inference goes too far.