In this case we have objects disappearing and reappearing, and the design of clothing and objects (headphones/tiara) being significantly different from frame to frame, pieces of sleeves blinking in and out of existence, headphones becoming tiaras becoming helmets... I'm sure you can find examples of such things in traditional animation but there's clearly something peculiar going on here due to the frames being processed mostly standalone, and it's clearly specific to this exact way of processing. Even if you "draw both the characters and the backgrounds from scratch for every frame", normally the animator would at least have the previous frames and/or overall design at his disposal as a reference. What's happening here is more like those crowdsourcing experiments where you let many people draw a single frame without knowing what the others are up to.