But in reality, pitch nights are generally garbage anyway. Investors put a lot of weight on "Who introduced the entrepreneur to me" and that carries more elitism than MIT. Again this is to get through all the noise.
If you have a project with traction and a large addressable market, the investors will follow the signal and stop worrying about pedigree.
I think the contention is that it's not actually a signal, we just believe it to be true, and it's a confirmation bias.
My (limited) observation is it's one signal of many that is real, in a very noisy world. And 2-3 years post-graduation it's much weaker than other work related signals.
1) They presumably have other opportunities available to them that they gave up to pursue the venture. It's hard to gauge the passion of a founder if they couldn't have gotten a job at google instead.
2) Investors want innovative products that eventually turn into companies, which means they want smart people who have a cool idea and can tweak the model when needed rather than people who just follow a business plan. Snapchats business plan would have been horrible if they had one.
As for upward mobility, pedigree is not something you're born with. Anyone can go to MIT, Stanford, or Harvard (and they give out quite a bit of financial aid as well).
This is a funny statement.