The title is a bit misleading. The study is basically comparing the path of the top 1% to the top 2% of the IQ distribution and arguing that it doesn't matter that much in term of extraordinary achievements (nobel prize, etc). If you compare the top 20% to the bottom 20% of the distribution I bet there will be a strong correlation to professional sucess.
And there's also probably a big difference between the top 0.01% percent and the top 1%. The difference between the top 1% and top 2% isn't very important for most types of talent. Being in one of those categories for athletic talent, for instance, wouldn't get you into a professional sports league of any kind.
https://www.honorsociety.org/articles/trouble-geniuses-malco...
“Gladwell cites studies done by Arthur Jensen that indicate the IQ level needed to successfully attend and graduate from undergraduate college is 115, after which Jensen believe IQ becomes relatively unimportant. For comparison, Albert Einstein, a well-known and commonly agreed upon genius, had an IQ of 150. Studies by Liam Hudson indicate that, ‘a mature scientist with an adult IQ of 130 is as likely to win a Nobel Prize as is one whose IQ is 180.’”
He gives the example [paraphrasing from memory] of an individual with an IQ of 170 who was so intelligent it impaired his ability to relate to normal people and hold a job.