> removing test requirements from admissions, under an argument largely related to equity. It's been a failure everywhere [...] among all application components, test scores are the single greatest predictor of a student’s future Yale grades.

It reads as though you tried to use the quote to support your conclusion that "it's been a failure", but the quote and the original rationale are optimising for different things. Something can be a success in improving equal opportunity while still leading to worse grades.

Or to flip it around: we could say admission testing "has been a failure everywhere" because it biases admissions in favour of certain demographics. But that wouldn't really be a fair assessment because being free of demographic biases is not the purpose of admission testing!