I would argue that there's clear difference between the video you showed and Skibidi Toilet. For one, your video is from a time on Youtube when "random images/clips are shown while unfitting music is being played in the background" was a genre. So it has more in common with this or this than modern Youtube videos or even YTP. Seriously, "something something while I played unfitting music" was its own genre way back in the day. The only real difference is your video uses the Source engine, which survives in modern Youtube.

Skibidi Toilet and all that body horror shit like Aaron Animations are also far too dystopian for early Youtube. Going by tone alone, I would peg the video as a post-2016 creation, which wasn't when the first Skibidi Toilet video dropped but was the time when the channel started and had this video, their most famous video pre-Skibidi Toilet. And it's pretty obvious the dystopian feeling comes from living and reacting to a post-Great Recession, post-2016, post-2020, "post"-Covid world.