I can't read the site (there's nothing in HTML) but is this a framework that doesn't produce pages viewable without JavaScript? If it is against HTML, my vote is against it.
This isn't a web application though (in terms of interactivity), it's a plain text page. Why do we want Javascript to serve plain text pages like this?
Also, on the WAI-ARIA site, the expectation seems to be that Javascript is used for dynamic content or widgets (for which there are Aria-roles), but that HTML is used for text content (correct me if I'm wrong about this).
Again, if you look at the source code of this page, I can't see how it would be accessible.
Could this could be used if the browser does not support JS?