What makes this any better than SASS or LESS?
I guess you could say this is like Doxygen for CSS?
That's my understanding; a good analogy.
I think the source of confusion is that he calls his project "Knyle Style Sheets," whereas a more accurate name would be "Knyle markup for Preprocessed Style Sheets" (or Kml*SS).
I think that there's a pretty big short-sighted buzzword obsessed culture associated with CSS. We need to realize that "CSS" is a lot like "Scripting Language". There are many styles of writing scripting languages, many scripting languages, and many implementations of scripting languages. It doesn't take more than 15 seconds to read one sentence and understand what it means. Let's look past the name.