As my wife likes to note, All Demos Are Faked:
— Jeff Emanuel (@jeffemanuel) December 11, 2012
…and I’m going to guess on this one that the particular method of fakery has to do with why there are photos of the technique and not video. Bluntly? The effect probably becomes really visible when somebody inside the thing moves. I’m also raising an eyebrow at the supposed lack of power source. Lastly: how does that thing look when you shift your angle?
Mind you, the military can still find a lot of uses for a drop-cloth that mimics the ground that it’s covering.