It's completely different. The underlying mechanism is the fact that observing the state on one member of an entangled pair changes the state of the other member.
More specifically, the important fact is that it's impossible for three particles to be (maximally) entangled simultaneously. So you can verify that no one eavesdropped when you agreed your one-time-pad.
Does it change your thoughts on the utility of quantum cryptography?
They get three photons to be entangled, but not "maximally entangled" in the (impossible) way that would be needed for someone to listen to a communication without being detected.