Could be the Mott transition. Could be filaments. Could be a different PCM method than what's been done before, although like you I have my doubts considering the durability claims. In any case, any of those resistive methods would by some definitions fit under "memristor".
Hint: also illegal to operate in close proximity to people, especially people who are on their own property, and don't want it there...)
Actually no, no it's not. Toy model aircraft aren't subject to any such law, FAA-wise. Yet, at least. If anything, we're talking about good old fashioned reckless endangerment, which has nothing to do with model aircraft in particular, but could be a charge in such a case (just like it would be if they were throwing lawn darts over the fence, or hit somebody in the head with a stray baseball).
The FAA has guidance about such matters. But flying a toy around like that has absolutely zero FAA restrictions in and of itself, with regard to people on the ground. It's likely to be a different story when such a machine is used commercially, but again, zero relevance in this case.
A good starting point would be to recognize the airspace above private property as part of the property, up to the level allowed to commercial aircraft. That would mean that drones could only fly above designated land surfaces.
Except there is ample precedent for that NOT being the case. Has nothing to do with neighbors flying toy copters around, or someone flying a Cessna at 500'.
It's a naive, domestic operating system without any breeding, but I think you'll be amused by its presumption.