Also mentioned by Darkspirit138.
That setup only works on characters with huge juggle hitboxes like Rog, Zangief, T.Hawk, and Hakan.
@5 Midscreen galactic tornado to U1 definitely feels like a 1 frame link, and it's after a long move so the timing can feel somewhat arbitrary, like linking after command throws or Boxer's overhead... it also only works against Vega, Zangief, Boxer, and I think that's it (maybe one more).
as a Guy player seeing space opera symphony hit like that out of corner makes me a jealous man. great vid though