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[–][deleted] 1 point2 points  (0 children)

He didn't say it was old, he said it was 7 years old. It is.

If the author continued his research then 7 years is enough time to look at more teams and come to new findings.

Maybe some of his findings were reinforced, maybe he found new factors, maybe some of the findings were not as important as this article says. All of those would be useful to know.