Sorry for the late late late update, but yea, as Will said, it only looked frozen.
I threw the egg with shell in liquid nitrogen, when I took it back out, the shell was cracked and the yolk and whites looked just like regular 'hard boiled eggs.' Unfortunately, when the egg warmed up, it just looked like a melty egg.
Don't ask why I even got my hopes up on thinking that eggs could be cooked with cold, someone told me about it when I was little and it just stuck in my head all these years. This was an interesting experiment though, because I've tried to freeze an egg in a normal freezer before and it wasn't anything close to looking "cooked."