Sometimes there are profound questions in life that must be answered, like "What is the meaning of existence?", "Are we alone in the universe?" or "What happens if you throw a paper airplane from the International Space Station?" Luckily, that third one has finally been answered, because of course someone would eventually.
I’m with you. It would probably slow quickly and not undergo Mach 7 winds once the air became dense enough to actually damage it.
Interesting thought exercise, but I think their experiments contained some flawed assumptions