Cached pages reveal the registration link, but it appears all routes crash back to the index. The admins are defiantly putting a halt on all new users... It used to be simply /register.php but that one doesn't work either.
Seems that logged-in users are still able to view the registration page and create accounts if one knows the registration URL. I verified it by making a new account for myself. I had to manually paste the registration URL into the browser from an existing logged-in account.