If the thing behaves as though it has no inertia and does all these amazing movements, what else does? A reflection or otherwise illusory object can do all that easily, in fact thats the default behavior.
I consider the possibility of reflection high by default, especially with the properties this thing has (glow around it, seems to immediately react to camera movements, movements that appear to violate inertia)
But I'm definitely no authority on this, just sharing my perspective based on previous similar things I've read about.
My best money would be on something experimental of ours being tested against our own aircraft, like some kind of decoy or jamming device.
Also, that fits with the jammer hypothesis, too. People are experimenting with feeding malicious input to NN's. They've messed them up with tiniest changes to image. One could probably do something like that with these techs, too.