It's a politically sensitive topic, so articles play up problems with IQ while playing down it's predictive success.

But even one of the articles you quote admits "The difference between a 79 and a 69 is highly noticeable, and the test can determine which is which and the reasons why."

Tests like ACT and SAT are highly correlated with IQ. As is the Armed Services Vocational Aptitude Battery (ASVAB) that the military uses. So when Google checks applicant's SAT scores, they're checking their IQ.

One important thing to note is that it's a better prediction of performance of a group than an individual.

Anyways Feynman's purported 125 IQ score translates to an expected SAT score (V+M) of 1210. Which won't even get you into any of the schools he excelled at.

If your issue is my comment about IQ tests in the 1930s, I can't actually back that up. I have no idea what test he took. But psychologists have done a lot of work on the tests since then.