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I would suggest that their timing is off. They say the European group of Amerindians came between "15,000 and 30,000 years ago" depending on methodology. My guess is the 30,000 years is the date using the assumptions they used for all of the other numbers (including the date of 144,000 for Adam and Eve and the date of 50,000 for humans leaving Africa). They gave BOTH dates for the group of Amerindians because 30K sounds WAY too far in the past to match the facts. Even 15K is stretching it, unless this was the first group of humans in the new world.
If that is the case, then many of the dates in this article can be sliced in half and still fit the data. That makes all of this pretty darned recent.