As a former Caltech undergrad it's hard to really disagree with the conclusions. I wouldn't be surprised given what I've seen / read if this changes dramatically over the next decade based on changes already taken place.

Median is also possibly not what an incoming Caltech (or MIT, or Harvard) student should optimize for though given that many of them will have relatively safe downsides. Mean for Caltech might be quite high (I don't know for sure). But given that I overlapped with multiple people who have certainly made large sums of money since graduation (about 10 years ago), I'm thinking it might look favorable for Caltech with a small student body.