I don't know. It works for RC helicopters of 500 size or so. I haven't seen autorotation performed with multicopters, though, so not sure how it maps to this application. I'm guessing these are fixed-blade machines. RC heli's manage autorotation via their collective pitch, which RC quadcopters (or hexacopters) don't have (collective). So it might not be relevant. But on the other hand, if the value of avoiding a crash is high enough, they could make the blades collective just for that purpose. Or maybe make one or two of the multiple props collective... I'd assume they already have a working solution to avoid falling out of the sky, but then, it isn't mentioned in the copy.
EDIT: There are quadcopters that can fly inverted, but I think they use powered servos with a reverse polarity. The value of autorotation is that it works when your main power source dies. So it all depends on the context and parameters (is there a backup battery of lower capacity available for emergency situations, say).
EDIT: There are quadcopters that can fly inverted, but I think they use powered servos with a reverse polarity. The value of autorotation is that it works when your main power source dies. So it all depends on the context and parameters (is there a backup battery of lower capacity available for emergency situations, say).