This is a TAS (tool assisted speedrun); in other words, hacks. Under the hood, there were pauses and checkpoints used to create this run. It's meant to demonstrate what the perfect run would look like, and for entertainment.
Full TAS playlist: https://www.youtube.com/playlist?list=PLaphiC09M5gbrOku24MZGbdyMtUKWqRdL
I originally planned to upload this back in February, but I found some shortcuts before I uploaded it. The backjump onto the torch is way harder than it looks, since you need to climb on it, without falling, and do a late jump off it. The flick to get to the last button requires you to be as high as possible so you can get enough height. Otherwise, more route optimizations!
Completed: Mar. 5, 2021