Sounds like descriptions of those crop circles we used to get.
Perhaps it's military software purposely made to test pilots on unknown/unpredictable scenarios?
What we do know is they can't brake like that in atmosphere without causing a wake, like laser/light holograms technology could, which is far more likely than alien-space-craft but the initial standpoint of this "sceptic" is - it's a spacecraft, a UFO, an alien and this is why.
Doesn't sound very sceptic to me, sounds like it's all confirmation bias and waving a phone around and mentioning a point of physics we don't yet understand as evidence for potential aliens was pretty dumb for smart guy.
I think he is great