The wording here is a little ambiguous. I understand why end use of panel software would be out of scope. However, configuring these panels does require sysadmin knowledge, and would otherwise be in scope.
The ambiguity is by design to some degree (or at least, so is my belief). Web panels around here are almost as popular as spam and malware.
I was surprised that an individual non moderator could place a question on hold that has been answered for over three years.
That would be a little surprising, but users with a gold badge in a tag that the question was originally asked with can unilaterally close such a question, with some exceptions.
Users with a diamond next to their name are moderators.
What's the process for disputing that status?
Well, you bring it up on meta, and/or flag it for reopening/moderator attention. Given the popularity of administration panels in these parts, though, I wouldn't get my hopes up if I were you.
A related question I have for you is why you care - all its closure does is prevent people from adding new answers, and given that it has an accepted answer, I'm not sure how this would really impact you at all. On the other hand, the existence of old, open questions about admin panels from back when they were considered topical is used as a justification for asking new questions, so closing old ones with a note that they're no longer topical does serve a useful purpose.