This is essentially a zone plate reflector which has two states, and thus switchable focal points.
The images shown lead me to suspect this is a binary zone plate, which has a much narrower bandwidth over which it would be effective.
However, this is all prototypes, if they can indeed make a zone plate that can be addressed as pixels, with finer control over phase shift at each pixel, there are quite a few places where it would be quite useful, in spite of the narrower bandwidth.