The article seems to be claiming that artists are different for the attention they give to detail. True enough I guess. The way humans look at the world is perceptual, whilst artists (a sub-class of human) tend to employ a more optical approach.

This is supported by this lovely paper looking at the difference between how artists look at images and how non-artists look at the same image:

Mao D, Kakarala R, Rajan D, Castleman SL. Understanding Photographic Composition through Data-driven Approaches. InVISAPP (2) 2010 (pp. 425-430).

https://www.scitepress.org/Papers/2010/28421/28421.pdf

(Of course they used an eye tracker)

In brief... non-artists dwell on regions of obvious interest (faces, bodies etc), whilst the way artists look is more wide-ranging. They may find a lamppost behind the human subject as interesting at the human.