I think this study reflects decades dumbing down and diversion from core subjects such as Math in PSs more than DEI. Sadly, students who can actually read and do math have become a sort of de facto elite.
As CA colleges and universities go, UCSD is not among the top-ranked, e.g. UCLA or UC Berserkeley, in the UC system. Who here, without using a search engine, knows their mascot? At the same time, UC schools are more demanding and respected than community colleges and many CSUs. IOW, UCSD should be getting academically better students, but those they are getting are deficient academically.
BTW, "Tritons".