I don't really see a technical contradiction with what Chad said, to the contrary, Fravor explains exactly why you could call that jamming since jamming is not only limited to the few jamming cues Chad listed ("strobe, champagne bubbles, “any normal EA indications”).
Interesting, thanks Chris! Does this classify as passive or active jamming, and why would Fravor say that there was jamming but Underwood say that there wasn't? Can you please explain in simple terms how there isn't a contradiction? Unfortunately Fravor's statements weren't very clear about the existence of jamming cues.
If it's a low observability drone and/or using radar jamming that's important for "simulating a blurry plane" because passenger planes don't usually get classified as drones, balloons, and other UAS. It makes no sense that a passenger plane would use radar jamming and there's almost no chance that a large passenger plane would be unable to be detected on radar- https://archive.org/stream/TheNimit...REPORT_1526682843046_42960218_ver1.0_djvu.txt