I've had conversations with a guy who works at one of the companies that makes high-speed cameras. One of the interesting thing to come out of those conversations is that below a certain threshold of frame duration (which is related to, but not necessarily the recriprocal of the frame rate) a camera with that capability becomes subject to ITAR, because supposedly said camera could be used to develop nuclear weapons.

My intuition is that the camera described in this article would be subject to ITAR were it developed in a western nation. But, I doubt China gives any fucks about that.