They didn't mean random noise as in certifiably truly random in a cryptographic sense... nobody cares about that for a silly demo.

Random noise as in a normal non-tech human cannot see anything discernable to them at all, without the motion component.

Hah, late reply, but as a generative artist, the True Randomness in Computing rabbit hole has no perceivable bottom.

As you said, I was _not_ alluding to more than being perceivably random/noisy.