The article says, essentially, that a basic strength and conditioning program is the way to go. The GP says that picking a sport that makes you fit is the way.
To add another opinion, that ties the two together, to the mix: think of the fittest people you know. To a person, they're probably obsessed with their chosen sport (which may be soccer, or bodybuilding, or weightlifting, or running, or ...). These people live and breathe their sport, and when they're not doing it or training for it, they're thinking of how to get better at it.
At some point, thinking of how they can get better at it is probably going to lead them to doing, well, a basic strength and conditioning program. That's because squats and presses and the rest of what the article outlines are still about the best the exercise world can come up with for almost all the athletes out there.
(For what it's worth, I'd strongly second the recommendations of the article for Starting Strength and Olympic-Style Weightlifting. They're both fantastic books.)