ARIA example under 2.2 fails WCAG 2?

Please refer to the example  in the ARIA 1.0 doc at end of section 2.2 which uses
[aria-checked="true"]:before { background-image: url(checked.gif); } 
I did read the note that follows too.

Does this not constitute a failure: F-3 and F-87
F3: Failure of Success Criterion 1.1.1 due to using CSS to include images that convey important information
http://www.w3.org/TR/WCAG20-TECHS/F3.html
F87: Failure of 1.3.1 due to inserting non-decorative content by using :before and :after pseudo-elements and the 'content' property in CSS
http://www.w3.org/TR/WCAG20-TECHS/F87.html

Thanks.
Sailesh Panchang
Tel 571-344-1765]
www.deque.com