Agreed. Wikis require editors. If you have enough users that the users can do it themselves, great. If not, you need someone specific looking at it all the time.

In this case, the page you linked to was just a redirect to the real info, which had not been vandalized, but no one was probably looking at the link. In the real world, if you came across a vandalized thing that you needed, you'd call the cops. It'd help if there was a contact listed on the Wiki that would have been equivalent to the cops -- well, repair crew, really.

But, for future reference, there's a link on every Wiki page that will show you the history of the page. Find the latest one that isn't vandalized, load it, click edit, don't change anything, and click submit, hopefully including a description of what you did (revert) in the comments field. I know that that's not intuitive knowledge, but there you go.