More of a permissions issue, but the store page links here to explain alpha access, but you must purchase the game to access the page. I'm assuming the same for all pages linked to the wiki from the store, such as requirements.
OP is correct, it doesn't seem to be available to people who are not logged in/paid members. This is the message it gives you: (imported from here)
Then you may have followed an invalid link. This is a fresh installation of Chrome and my first ever visit (imported from here)