A Scanner Darkly is more like a manual post-processing effect than animation.

The creators reference that as rotoscopy very often, there are some cool details (not much related to this discussion) here https://blogs.iu.edu/establishingshot/2022/03/28/rotoscoping...

I'm not saying it isn't really roto, I'm saying it's not really used here as part of an animation pipeline so much as in a compositing pipeline.