If you look at his blog, and read the captions you get an idea of how controlled his experience is.

First, the camera doesn't get checked (although it might have been) because they have a "no photos" rule in certain places, like the mausoleum. The tour is guided and controlled and he never allowed to go anywhere or leave on his own, so he is only taken to the best places DPRK has to offer.

The simple reason for not having less impressive shots is he was never taken anywhere or allowed to take pictures where things were less impressive. It's not misleading, he only had pictures of the places he was allowed to go (which they wouldn't likely let him into areas that gave him a negative impression) and was allowed to use his camera.