Directories for creating new skin color

I am trying to follow this snippet:

https://www.themesandco.com/snippet/create-new-skin-color/comment-page-1/#comment-43925

But I’m having trouble with the directions that state:

“Go to customizr/inc/css and move a copy of red.css to customizr-child/inc/css. Now copy the 3 subdirectories (fonts, img and rtl) from customizr/inc/css to customizr-child/inc/css/”

The first part (moving a copy of red.css to the child theme) is easy enough. But then I’m confused. I’m not seeing “three subdirectories” in my customizr/inc/css directory. The only subdirectory in there is “fonts”, which I’ve also moved to the child theme. “Img” however is not a subdirectory of css, however: it is at the “inc/img” level. And there is no directory called “rtl” located here. Am I missing something?