When I originally saw the Nimitz footage, I assumed the black blob was actually in infrared
But it's actually in TV mode.
I wondered if I could recreate it, so I made a clip of a silhouetted plane rotating, and looked at it from various angles:
Then tried down-sizing it and adding noise etc.
The version in the video I did above still has wings detectable, but I think it gives a reasonable idea of how the shape might have come about - especially with multiple generation of copying of the video, possibly including some analog format like VHS, and then a very low resolution digitization.
Still, I'm not sure on exactly what pipeline would best simulate what we see. I attach the source video I used if anyone wants to play with it.