There's a correlation between parental income and IQ scores too. There's also a correlation between parental income and GPA. It's just a correlation, though, and it does not follow that a good standardized test would result in the average score would match across different parental income groups.

Just because a test is standardized doesn't mean it completely eliminates all confounding factors outside of the test, but it does mitigate some of them. Equality and equity aren't the same thing.

Certainly, without reliance on standardized testing I'm somehow certain that Braden who got a helicopter pilot's license at 16 so he could fly the family helo from Manhattan to Westchester is going to do better in admissions than Tyrone who excelled in academics and was lucky enough to attend a technology magnet school, but grew up in the projects and had no access to anything outside of what school and the library provided. With SAT tests included, the fact Braden made a 1530 and Tyrone made a 1970 plays a factor.

That's what folks are saying.

But there’s a much greater correlation between parental income and other measures you could use to evaluate applicants. Even height has parental income correlation, you can‘t eliminate it completely.