It's a laser photon drive? Using a laser to boost a solar/light sail has been known for decades how is this any different?
Randy
Thing is, that it's supposed to be energy-efficient photon drive. The traditional photon drive is a terrible power hog; it consumers 300 megawatts of energy for 1 (one) Newton of thrust. That's why it is not very useful, despite being able to reach as close as possible to speol.
But the EMDrive was supposed to be several orders of magnitude more efficient. Its supposed to took only about 10 kilowatts of energy per 1 Newton of thrust. And this is completely different story.
(I'd say a bit scary one, because if this array worked, there is nothing that would stop anyone from strapping it to a block of solar panels, and sending into Oort cloud to accelerate for a few years... and return back as relativistic kinetic missile)