This is an ad hominem, dressed up nicely. And from the article that I just read (maybe we're being A/B tested for ideology?), nearly all of the deans made clear exceptions for exceptional students. What a bunch of higher-education zealots.
You also got the "arguments" wrong. All of them. None of the deans made an argument for greater success due to social connections (Wadwha makes fun of this idea at the top of the article!), none claimed that Zuckerberg was successful "because" of his time at Harvard (one made the argument that he "needed it for vetting", which is a different argument entirely), and none made the argument that "most" entrepreneurs are college grads (...or anything at all, for that matter; except for the rather uncontroversial argument that "most entrepreneurs fail", very few generalizations were made).
The most important arguments were the ones that you ignored:
1) Thiel's "experiment" isn't actually an experiment. It's a vanity exercise that will prove nothing, because it has no controls.
2) Most entrepreneurs fail, but you can easily point to the exceptions to make (fallacious) arguments about the value of education.
3) An engineering degree improves the average outcome for students, even if it doesn't help the exceptional cases.
4) At the companies founded by famous college dropouts, you'd be incredibly hard-pressed to get a job without a college degree.