I interpreted the parent comment's "Really now?" as being more like "No duh!" In other words, pointing out that, within some fairly large group of people, only a very small percentage end up being "game changing professionals" is pretty obvious. The author's whole line of argument is pretty absurd - if you find a group where "only" 8 out of 2000 people become Nobel Prize winners (nearly half a percent!), where only 870 people ever have won the Nobel Prize, it means that group is leaps and bounds above just about everyone else in doing whatever makes Nobel Prize winners.