The basic idea is that applications are going to sell highly as part of their nature (he cites things like Microsoft Office as "non-game" competitors to PC games that would top the sales charts if charted), and that people who read enthusiast media about games want to read about games. Sales charts, especially in Japan, will get filled up with non-game material, pushing game coverage out. It's not that training games and non-games are stupid, necessarily (though that does come up!), but just that they aren't games.
It's an interesting idea to separate console non-game coverage from game coverage, and there's possibly a space out there for a site to do it. But right now, there isn't, and the people who care to read about things like Okashi Navi are gamers. For our own part, we're a DS blog, which means that anything on, about, or relating to the DS is fair game, not just games. And we would never dream of depriving you of Duke Saraie's tights.