I agree with your description of he dynamic at play. It raises two questions:
1. Is the money that the startup attracts responsible for its success? In other words if a mediocre company goes through Y Combinator and then attracts a $55 million round, is it more likely to succeed than a great company that does not? (Let’s day the mediocre company doesn’t squander the cash wastefully but slowly looks for the product market fit)
2. Are there fundamentals that can be distinguished from an “observer effect.” Suppose everyone believes that a company coming out of Stanford is more likely to succeed than one coming out of (say) Babson. Does believing it make it true because the company attracts more money in each round?
These two thoughts are variations on a theme of the role of signaling in picking out fundamentals.
Edit: I should also point out that GV might also use “true” fundamentals like search results, trends, etc