Richard Feynman was obviously brilliant, based on any measure of real life impact you can imagine. Meanwhile, an IQ test is just something we made up.
The only reasonable approach to this set of data is to conclude that IQ is not as good as we wish at actually measuring intelligence.
The pattern recognition skills that most IQ tests ask are fairly similar to solving a lot of exam questions. But they're only a part of the skillset that you need to become a great physicist.
If Feynman had prepared for an IQ test I bet he could have made it to 160. The kinds of patterns you see on IQ tests can be trained. But it's not a particularly interesting pursuit. I've personally done a professional IQ test and reached 130 while in university. Because in school you're training similar kind of problems regularly. I'm sure if I did an IQ test now I wouldn't even get close to 130, because I don't do exam questions regularly anymore. I also can't quote any successes similar to Mr. Feynman, so I doubt this is meaningful.
What IQ doesn't measure is curiosity. It doesn't measure how well you connect disparate disciplines. It doesn't measure how ready you are to upset the status quo. And if I read Feynman's book "Surely you're joking Mr. Feynman" correctly (great read btw), it was these things that actually made him think about physics problems from a different perspective.
I don't have the exact citation but it is fairly well documented that he scored well on other very challenging tests that correlate strongly with IQ (not to mention his actual career accomplishments).
Needless to say, people bandying around his score on this one test as evidence that he was 'bright but not in a high IQ' way is disingenuous or ill-informed, to say the least.
I could be wrong but I believe the common consensus is that his 120ish score on that test was not representative of his actual IQ, and was maybe the result of some other circumstance.
I'm not an expert on psychometrics, I think all I'm trying to point out is that Feynman performed highly on other tests that likely correlate highly with IQ, so I believe it more likely that there is some confounding factor at play other than this being representative of his actual IQ.
Or maybe that his IQ averaging here doesn't tell us much about which domains he scored highest in (some posit that he may have scored very poorly in a verbal section vs. mathematical etc.).
Sorry for the snark but do you honestly not see that there is a difference between the two cases?
[1] An unreliable/uncertain one, even.
I think the argument of "so and so was a genius so don't bother you can't do what they did" is a really defeatist attitude.