The linked article makes the claim that the majority of comp sci majors cannot write FizzBuzz. That's a bold assertion; how did the author sample such people? I suspect the sample pool was people applying for a position. There is a major selection bias there. First, people who fail many interviews will do more interviews than those who do not fail, so you'll start with a built-in bias towards the less competent (or more nervous).
Second, there is a large pile of money being given to people who make it over a somewhat arbitrary bar. As a random person, why would I not try to jump over the bar, even if I'm not particularly good at jumping? There are a lot of such bars with a lot of such large piles of money behind them. If getting a chance at jumping over those bars requires me to get a particular piece of paper with a particular title printed at the top of it, I'll be motivated to get that piece of paper too.