While the link above should eventually work, it sometimes yields a 404 Not Found error, perhaps half of the time (even though there's a single IP).
When you manage to access, you'll see the last news item on that website is more than 6 years old. The refcard about Debian is a broken link (actually, a link to an ad portal). There are a lot more refcards, and no doubt some valuable information in these. However, since they're not Debian-specific, it shouldn't be hard to find them or better alternatives via a search engine. Therefore, I doubt the link is currently more valuable than noisy, even if it wasn't for the 404.
I recommend to remove this link.
-- Filipus Klutiero http://www.philippecloutier.com