Your response does not address the passage you quoted. First of all, the author didn't ask them what made them successful. The quote has facts about their lives, not their thoughts on what made them successful. Second of all, the author doesn't claim that these traits are a sufficient condition for becoming rich; only that they'll help.

And what the article says is closer to: "Google and Yahoo and most other successful internet companies have being in Silicon Valley in common, hence if you want to be a successful internet company, being in SV will help." Which is absolutely true.