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I don't understand your question. Imagine 70% of entrepreneurs head to SF or NYC because they've heard that that's what you do. Further imagine location has no influence on anyone's chances of success.

By construction, 70% of successes come out of SF or NYC despite the fact that being in SF or NYC is unhelpful. Large number in -> large number out. "A large number of startups come out of SF or NYC" is guaranteed by the premise you're questioning, "ambitious people go to these tech 'Meccas'". It's about as far from a contradiction as you can get.

Every so often there'll be a story about how there's a thing that "doubles" your risk of some type of cancer. Which turns out to mean your chance goes from 0.0000001% to 0.0000002%.

In much the same way, moving to SF may "double" your chance of winning the startup lottery. And buying two actual lottery tickets gives you twice as many chances of winning the jackpot.

If there's 20x the number of startups and 20x the number of workers, the individual odds shouldn't change.