REQUIRED:
Ctrl + S, save as a .py file. Then install as you would any other Blender addon.
https://pastebin.com/raw/0Ak2kkUS
NOTES/TIPS:
You must sort the frames imported as shown in the video, frame 0 top down.
I do not know of a way to procedurally & endlessly loop the keyframes. Cyclic modifiers don't seem to work.
To make the animations shorter/longer, go to the first keyframe and scale upwards.