User CSS in ARIA24

Hi all,

I'm baffled by the recipes in the new technique ARIA24 
(https://www.w3.org/WAI/WCAG21/Techniques/aria/ARIA24), specifically the 
"User CSS" as compared to the "Author CSS". According to the technique, 
'The key is for the author to semantically markup icon fonts 
with|role="img"|. Then the user's font replacement selector can hook 
into that semantic and exclude|role="img"|':

|*:not([role="img"]) { font-family: Verdana, sans-serif !important; } |

Does this technique actually expect the user to have that cryptic 
selector in a personal style sheet?

Baffled,

Jeff