With the book of Mormon, there is not one single source, outside the Book of Mormon, validating a single place, person, a single event. There isn't any of that, so the problems that DNA poses for the BOM, simpy exemplifies the problems already evident in archeaology.
There is essentially nothing to link the old world with the new world.
Not only do the Native Americans not come from Israel. It gets worse for LDS members. We know where they cmae from, they came from norhtern part of East Asia.
There is no evidence of any Hebrew migration, not in genetics or for that matter, in any other source, whether it be archealogical or linguistic.
Has anyone brought up the fact that the so called "descendants" of Lehi that are being tested for DNA were genetically altered when the Lord Cursed Laban way back at the beginning of the BOM, roughly 570 BC? Every succeeding generation that "mingled his seed" with them had the same genetic change. I don't hear anyone talking about this? These people became physically different from the Abrahamic line from which Lehi came.