I’m pretty sure they mean perceptible complexity at the level of the human eye. Of course, everything has quarks and leptons in infinitely complex patterning.

>I’m pretty sure they mean perceptible complexity at the level of the human eye

That's precisely what they're wrong about.

Take a look at tree branches. A field of grass. A stone cliff.

Now take a look at human-made decor: drywall, plastic, laminated boards.

Which one has more visual detail?