as some other people have pointed out, "europeans" in this period would not have been r1* or migrated in from asia, but would likely have migrated in from northern africa and probably have been light brown, like modern arabs.

on the one hand, i'm willing to mostly write this off as mormon revisionism. the dna evidence linking natives to siberia is pretty overwhelming.

on the other hand, i think it's important to point out that it's not necessary for large numbers of solutreans to have migrated to america in order for the technology to get there. a few stragglers is all it really would have taken. and, i don't find the idea of a small group moving along the pack ice - or even being lost at sea - to be all that outrageous.

the key piece of evidence would be to find some of these blades somewhere along the way. now, i want you to note that what apparently led this guy to this hypothesis was that he couldn't find any blades in alaska. but, the same problem still exists - now he needs to find blades in...

wait. those ice sheets are gone. so....

this is unfalsifiable.

it's a nice story. but there's no way to prove it one way or the other. unfortunately, it's not even wrong.

regarding the x chromosome, i think that carthaginian or greek contact in the pre-roman period is far more likely.