Thanks Bruce,
I’ve updated my draft-fork:
https://rawgit.com/alastc/wcag21/graphics-contrast/guidelines/index.html#graphics-contrast
(Hopefully the typo on the first word (“TThe”) doesn’t get cached too long, I have fixed it.)
From the comments, I think the only one not addressed* is from Jonathan Avila:
“The term "non-text content" can include audio, sensory, etc. so I think it is too broad for this SC.”
It was changed from “graphical information” to “non-text information” in order to exclude text-in-images.
Only one commenter thought it would apply to text-in-graphics, so if this definition fits better (and other people agree it can be dealt with in the understanding), then I’ll change that back.
Cheers,
-Alastair
* Of course, people might not like how the comments have been addressed, so I’m not assuming comments are closed!