Erm.. Wha? The Long Tail is just a concept.. It's not restricted to user-generated content. I'd say that Google Maps is the perfect example of The Long Tail, because even though most people spend their time looking at San Francisco or wherever, Google Maps has photos of most of the earth!
Maybe the article would be better retitled "Applications Built on Google Maps Can't Fit the Long Tail". But even that's debatable.
You're right--that probably would be a better title. And yes, like many things worth saying, it is debatable.