This video comes from the file "gilda assets.swf" inside "FUNKIN IS MAGIC.zip" file in the "PONYSHIT" folder bbpanzu shared on 2022. I had to edit the flash file using JPEXS Flash Decompiler to remove scripts that triggered the characters' movements using the key, which made it possible to the program Swivel to export it as a lossless video without entering an infinite loop. Besides that, I also deleted some rough sketches behind Gilda that appeared while she moves, though I didn't remove the pony reference sheet sketch from the last frame.

Original files from bbpanzu here.
https://www.mediafire.com/folder/lpedl7fsxhbjs/PONYSHIT
Don't worry frens. If bbpanzu deletes them, I'll reupload them and share a new link either in an archival thread or a new thread on /mlp/. ;)
And my edit of the flash file called "gilda_assets_edit.swf" here.
https://files.catbox.moe/00vdr1.swf