Yes, this may be true to some extent, but high IQ is still highly predictive of success at life by all sorts of metrics. Things like educational attainment, income, recognition/acclaim, career advancement, creative output, etc. Yeah, most genius-IQ people do not accomplish much compared to someone like Einstein, but still more than the general population in the aggregate. Feynman's 125 score has never been corroborated, nor is there any description of the type of IQ test. It's reasonable to assume Feynman's quantitative abilities were many standard deviations above average. Outside of entertainment and sports, it would seem like successful people tend to be high IQ, like a high IQ is necessary condition. As the article itself says "Given these findings, it seems likely that intelligence is a necessary, but not sufficient, condition for great creative achievements." I wish it was not this way but this is what the evidence at least suggests.
IQ is largely out of fashion due to some very uncomfortable truths about it… It is indeed still the best predictor of success. It is also very innate and genes have a lot of influence on it. Not much that can be done with equity about it.
This is why NIH forbids the use of its genetic data for research on intelligence (and several other topics).
You can be highly intelligent, but not have any entrepreneurial traits meaning you can't turn ideas into income streams. Also you can be well credentialed but not necessarily bright. Don't confuse education with intelligence.