Don't know but there is other research that has been supressed by orthodox archeology that show there were ancient civilizations on the continent up to a half-million years ago.
Hey, Rennes, I am one of those archaeologists you're talking about and we're not supressing anything!
As for the article you posted, blam, I emailed an archaeologist in that area when I saw this here a year or so ago but got no answer. I have emailed him again so maybe I can find out what this is all about.
Current research is supporting the early coastal migration theory, that suggests different origins for the early coastal cultures and those who came somewhat later via the land bridge through central Canada. Details are still being worked out (as usual), but mtDNA is starting to point in that direction as well.
You're aware that there is no evidence of homo sapiens prior to 200,000 years ago and that the oldest evidence of any civilization anywhere only goes back about 10,000 years?
I don't suppose you have a link???