I don't know if you've ever been in a small private aircraft, but if you have you may have seen another plane crossing your path. It is quite hard to see such an object until it is right on you (thank god for ADS-B). I couldn't imagine the same situation in a fighter jet. Having also seen things like balloons and birds while flying, I can tell you that things don't look the same. Your perspective is really different and optical illusions are abound (people even frequently misinterpret flight paths looking up at planes and birds). Yes, you get training for this, but at the same time that training doesn't break the illusion.
80kft in a second? Remember that the speed of sound is ~1.1kfps (at atm). But 80 times that? The sonic boom from that would be INSANE. I'm going with new radar new glitch. Per the video, they don't describe seeing this movement except on radar and, from my understanding, not the other object with their physical eyes but the weapons systems (which the 60 minutes video even shows an example of a glitch with Go Fast).
Why are you being purposefully obtuse?