Interesting article, SunkenCiv. I am not surprised the dates are getting pushed back. Much of the good recent research points to earlier and earlier dates of the first settlement of North America.
But, the concluding sentences of the article leave me a little “meh.” Color me a skeptic, but I am unconvinced that modern Southwest Indians tell stories directly related to this artwork. (And that is coming from a Choctaw who has respect for oral traditions.)
I agree, the population shifts and new coats of paint as it were aren’t qualitatively different from every other place humans have lived.