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.
If you compare the top 20% to the bottom 20% of the distribution I bet there will be a strong correlation to professional sucess.