Human pixel art tends to be very deliberate about the exact colors of every pixel and their placement tends to follow idealized (but not necessarily geometric) shapes.
The last time I saw dithering this sloppy was decades ago when people would scan photos as low color images. It is its own vibe, but it's a cold and rough one. These artifacts feel more "realistic", but it felt like slop back then too.
They are. And they are charging $19 to buy AI generated art (https://safaelmali.gumroad.com/l/lofi-cities-complete-collec...).