The author of that also uses a great deal of selective evidence, flat out ignoring genetic research in relationship to music, for example. Specific genetic sequences have been linked both to perfect pitch and to success in classical music. If you can't find it via a quick google search, I'll be happy to provide citations.

Evidence for the role of genetics in running, swimming and a variety of other sports is equally overwhelming. In short, he (and others like him such as gladwell) sell a fantasy that millions, possibly billions would like to believe. It's an excellent strategy for selling books and developing a base of hard-core fans, but it's just not true.