Hi Dave. 
@ondrej covered everything well, but I wanted to follow up as well.
Sorry it’s confusing. We try to communicate clearly at all times, so I’ll let our team know your feedback.
I see it says, “Extra staff users” in the add-ons, that must be where you are reading that.
We are about Civilized Discourse, so of course we want your community to remain safe. 
The add-on you are looking at is not designed for your use case. In the link shared (Trust Level Permissions Table (inc Moderator Roles)), you’ll want to check the “Category Moderator” column to see if that permissions group will suffice for your needs.
Let us know if you any questions. 