An interesting article, and the author makes a good point in mentioning how much the spanish-speaking world is ignored in the world of games.
Castellano is the third most widely-spoken language in the world, whichever way you measure it*.
To cite one example, SWTOR, (Star Wars The Old Republic, a very popular MMO), has a French Server and a German server, but no Spanish server. Obviously this is a question of money, and I understand that. Bioware is a for-profit business, not a charity.
*I mention this because English & Mandarin are #1 and #2, but they swap places depending on how you measure it. Mandarin is #1 in native speakers, but English is #1 in total speakers (because so many speak it as a second or third language.)