The actual problematic link was a single link, apparently - I don't think it's reasonable to have automated systems ban a site from google for a _single_ link, which might well be a false positive. They're trying to show they don't have a double standard though, hence the manual action.
> I don't think it's reasonable to have automated systems ban a site from google for a _single_ link
No, but it would be reasonable to ban the post sporting the offending link.
It also would be in the benefit of Google's users to demote pages that are content-free. I thought this was what "Panda" was all about, but I'm not sure if it's working?