The link on that page should have been removed ages ago and we have a request in to have it edited out, but it may be a little bit longer until it can be. Sorry for the confusion.
Aye, that is one of the issues we had with it because it detected if the realms were up, but not if they were available to the public. There are some processes during maintenance that requires the realms to be online, which can be confusing. We’re hoping to have the overall thing updated at some point.