Sure, if you want to examine companies over 15 years (as in your list) you can find companies with big VC in many different geographic locations. That doesn't chance the fact that most such companies are in the valley. I find the idea that you should be in the valley if you want big VC relatively straightforward and uncontroversial.

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Sidebar: Of course, if you're going to go for a different type of startup than YC's particular brand, you can do it from anywhere (central Japan, for instance). The article refers to such startups as a "lifestyle businesses". I find this terminology hilarious considering the most prominent example of a "lifestyle business" in our field has funded a racecar build by advanced beings for one of its founders.