i'm a dumbass and don't know physics but I can use my noodle to reason with ideas. the alternative to the universe being "pixelated" at the planck length, if you will permit a crude analogy, is just things being allowed to be infinitely small or infinitely big, right? I don't see how things couldn't also be a simulation under those circumstances, as well. But if reality itself is a simulation, then the word simulation essentially loses its meaning, since its meaning is derived from its contrast with reality.