I can't believe everyone here missed the point. The cheapest DSLR costs $400. It's not convenient to carry. It does ONE task. If you don't know how to use it, it won't take great pictures.
The author is saying "If you spend some time learning to use the camera in the device you already own, you can get acceptable results and save the money."
It's like my saying "The typical family member doesn't need a new computer. They can do everything they need to on a $50 lease turn-in with a couple of gigs of memory added."