I hate to say this, but the article is complete bullcrap. Have you even seen the movie he references ? The protagonist is supposed to be this "naturally talented genius" who detests the bookish Indian academic education system, so throughout the film he takes potshots at the stuff he's taught in school, ultimately choosing to drop out without a degree until the Dean formally requests him to take the finals, upon whic…
I solved that thing in less than 2 minutes too, and bet my pinkie finger nobody would take more than 15 minutes to figure it out. There is some background of truth in the article, that most people lose the will to be creative (not the ability) over time. But it's over-generalizations galore.
You would be absolutely amazed at what that does to your problem solving ability. You actually stop over-thinking. You don't go to your advanced number-theory knowledge you may or may not have and you look for a simple solution.
Sorry, but everyone that read the article and then solved the problem is tainted.