This is either WR or 2nd place. No idea how I would get in touch with the #2 slot to ask if he knows something.

Some ideas

Maybe they discovered how to get a small amount of extra height. This would be useful in sequence breaking multiple places.

Grinded out large portions of RNG and execution. This seems unlikely for a game this unpopular.

A type of IGT manipulation that is not editting the IGT but rather doing something like a segmented time. This is my current working theory.