Aren't "digital" and "quantum" two names for the same concept?

(But, no, quantum physics didn't settle on the quantization of all data.)

I'm not sure if a digital universe would necessarily equate to a knowable universe.

My main point of disagreement with the philosophy would lie in the ultimate weakness inherent to a digital explanation: the infinite points in between.

No, not really, quantum physics could be simulated using symbolic computation. Digits are not a purely human concept. They belong to mathematics, which is something that humans uncover, not invent.