Board Thread:Support Requests - Getting Started/@comment-25438558-20140919114400/@comment-3247345-20140919184757

According to the close policy:

In the case of complete closure of a wiki that previously had content (that did not violate the Terms of Use), the database of content would be made available for download.

The link to the wiki allows yo to download the content, which is why I suspect it's not a TOU closure. Either way Special:Contact/general would be where you request to reopen.