The total movement is still the same. Instead of moving 5 pixels per frame in one go I split those 5 pixels up into 5 separate 1 pixel movements. That simplifies some things: Instead of moving 5 pixels and seeing "oh, now I'm overlapping something, where do I go now" I can just go "can you go to the next pixel? Yes? Move." Pixel is actually the wrong word here because a screen pixel is made up multiple subpixels internally but the idea is the same. You should really take a look at the linked blog post because the idea is very interesting but only works for integer based positions I guess so it lends itself to pixel art.