This either means that there are moderator alerts which have not yet been processed, or it was a direct deletion.
For example, the forum rules were several times subject for moderator alerts, some people just do not know how to work in a forum and use this function to ask questions. After moderator review it became visible again.
A direct deletion is an extraordinary rare case, usually used in case of spam or after several warnings.
The only person who can answer your question is Sue. I tagged her, so she will get the message about this discussion