As a side note, this kind of speed run has become more popular in the recent years for a combination of reasons: - First, it's difficult to improve on the regular world records since they're so optimized (just have a look at Quake Done Quick and its sequels). - Second, the emulators available to the speed running community have evolved. They now include better ways to track what's happening in memory. - Third, the games themselves are understood better (as recently exemplified by the Super Mario 64 full reverse engineering).
So it's creating a whole new genre of runs that simply isn't about execution anymore.
If you're interested in the topic, you might like the Super Mario World speed run that uses a similar technique (https://www.youtube.com/watch?v=gECESOoU8Es), or the recent work on removing randomness from Wind Waker runs (https://www.youtube.com/watch?v=1hs451PfFzQ).