Hopefully said, but true?
It would be nice if that were true. However, as Watts Humphrey and the SEI people are at pains to point out, people rarely do know how they got to be successful. That's why Humphrey (and more generally folks like Peters and Waterhouse) sells well, and deservedly so.
I expect that a lot of "successful" teams would benefit from reading this article and saying to themselves, "now, we avoided that myth, but just how did we do it?" And even more so, less successful teams would benefit if they could articulate what they did as a "best practice" recommendation.