If your request for evidence is about the claim that most Uchicago students receive aid: https://news.uchicago.edu/story/financial-aid-budget-forecas...

If its about the claim that this is an example of price discrimination: that is an opinion I formed while I was at the University and spoke with some folks in the economics department about it. There is a class offered in econ about the economics of education, and that certainly hit the point home that financial aid is a type of price discrimination. I couldn't have paid for the tuition in full, so I myself received significant financial aid and supplemented with some student loans, so I got to see a bit of it first hand.

They are mixing financial support/debt and grants it seems in the writing. Getting loans isn’t the same as getting money you don’t have to pay back.