By proxy, yes, but not directly and there's a big difference.
IQ is just an aptitude score, it's far more objective and unbiased than an interview.
Why have an objective test for what you want when you can introduce subjectivity and racism for the same goal? It's the American way.
Ultimately that can be used to accurately predict an IQ test, and vice versa.
Same with MCAT, or any other "aptitude" test.