Yeah, I call BS on that one. Today, you can buy TV shows on DVD where the production company fits three or four whole 22 minute episodes on one DVD. DVDs can hold much more data than that right now and it's wasted so that people can use more plastic and create annoying multi-disc sets where you're always having to get up and change over. Maybe some subtle campaign to get us to watch the anti-piracy screen more often?
Actually, in my own experience, a single-layer DVD only holds that much when the video is highly compressed. Using maximum quality settings, you may not even be able to fit a single full length feature, more than one episode of an hour-long program, or more than two half-hour-long programs. You may be able to fit those four 22-minute episodes you mentioned on a dual-layer DVD, but not much else if any of it was created with maximum quality.