I love these, they are always really impressive. They've done the same with Ocarina of Time in the same event[0] to inject entirely new levels into the game on the fly and even give it Wi-Fi capabilities (sort of)
Everything is on GitHub, so here's the code that was injected into the game to read commands from TASBot over the controller port: https://github.com/triforce-percent/triforce-percent/blob/01...