I think the issue revolves around the notion of "busy". The article notes that spreading your work in small chunks distributed around the day decreases your efficiency - something quite obvious if you step back a little from what you do. Still, most people (with myself being guilty) tend do get disrupted and spend time on hackernews, ... interrupting their workflow. So the argument boils down to "being elite is a matter of better focus, not a matter of more work hours."
The thing is, being successful in most things doesn't require being "elite". Instead it requires a ton of traditional work.
Certainly, being focused can be a good thing, and can definitely mean you get more done in the same amount of time. Most of the truly successful people I know, though, are both focused and busy. If you work twice as fast as the average person, but also spend only half the time, them you aren't more productive.
