Really have to call into question the ethos of the author. Former gawker writer.. no psychology credentials to speak of. These are just results from an N=1 experiment.
I don't think the amount of utility for guitar is the same as for video games.
I understand very few people get to be professional guitarists or gamers. However, after that there are rapidly decreasing returns for video games. Guitar can be a source of pleasure for people you meet. It's a far more interesting skill than playing video games decently well. Guitar challenges the brain more; its learning curve extends farther than any video game. Guitar opens up a world of creativity and improvisation, name me a video game that can provide something at that scale (I'm an avid gamer so I'm sure there are none). Plus, it can get you laid.
I just don't buy that playing video games can provide much benefit. It seems like a meager reason to justify a questionable habit.
I would compare it to benzos. They can tide you over for a short while, but long term it leads to dependency. And there are much more productive alternatives out there (Like exercise, for both cases..).