I literally have no clue how this happened, but it is verified and legit.  The guy is apparently speedrunner “Blubbler” and has some sort of magic powers which lets him do what an average person can do in about 2 hours.  I spent a ridiculous amount of my childhood trying to beat this game and at no point at my prime could I have beaten ‘Super Mario Bros’ in under 30 minutes.

[Kotaku]