It wasn't his usual hate-inducing performance, but it was blog post, not an article, afterall.
He specifies the "retail box" PC game market is shrinking. The days of boxed PC games commanding retail space and walk-in-customer attention have been rolling downhill here. Shelf space for PC games IS shrinking here (consider what country is shaping his perspective, and not counting online retail).
The major outlets here for buying PC games would be small specialty stores like GameStop, big electronics/media dealers like Best Buy, and the more localized everywhere-casual-markets like Target and Wal-Mart. In my town, Target/Wal-Mart PC game selection rivals their PSP selection. Best Buy isn't a great indicator since they carry lots of 'everything' no matter what. But the hardcorest niche that is GameStop is really interesting since PC games don't even have space *on the wall* anymore. A sign of decline? At a glance, 50% of wall space used for new games, and the other 50% is used for pre-owned games, including last-generation systems (which apparently bring in more business than contemporary PC offerings).