"Reading" code in this sense doesn't just mean explicit review by different people, but also as in reading it subconsciously as you scroll through your own code.
If I see a chain of numbers like 1, 2, 3, 4 my brain has to recall the order of parameters or look it up.
If I'm looking for rectangles that should be wider than they are tall, I have to keep thinking "the third number should be higher than the fourth number"
Oh and I can't just Cmd+F "width:" or "height:" either.
It's unusual to sit down and read a subroutine for pleasure, but it's common to read it when you're debugging a problem, trying to figure out how to extend the subroutine, refactoring something it calls, or doing something similar somewhere else.
One of the most pernicious myths of software engineering is that it happens.