This TAS took a lot of time to make, and was recently showcased on twitch.tv/parrot_dash. The recording of the commentary can be found at    • Final Goodbye Minimum Dashes TAS  Sh...  . While hopefully all of your questions can be answered in the commentary, here's a couple of them:

What's a TAS? A TAS stands for Tool Assisted Speedrun and it means that instead of pressing buttons on a controller to make the game move, instead we type up a list of buttons to press for a certain amount of time and then tell the game to press those buttons in that order. This makes it so that it is no longer limited by how fast and precise humans can press buttons, and is only as limited as how well we can write them.

This TAS is Restricted. This means that spinner stunning and spinner freezing is banned. The descriptions of my 100% SemiRestricted and 100% Unrestricted have full explanations.

Contributors: (unsorted)
Alexa
Cr33pyCat
aqmlyn
exopta
Renatotheflowey
gnommis
pansear
atpx8
Bred
Bain8renn
Janosch
DanPark
Luzid