Single post in Legibility Guidelines
You go over the regulations and such pretty well but I have to ask why does this matter? Why does this rule exist? By the sound of things it's for some people with visual problems or a kind of colour blindness? But if you can't read someone's about me it's not the end of the world. If you ask me it's that persons "about me" they should be able to style it however they want (without being offensive or anything crazy) and while it's in good taste to make it legible to read they shouldn't be limited by that.