Nice one, OP. Some might have really been seeing the moderator without knowing that it's inactive as long as the board is being managed by others who share the same duty with him or her.
It has been finalized by theymos already. It has been indirectly posted by him in his comment.
Your statement is indirectly what Rikafip explained above, which means the question by the OP was appropriate and has been handled and serves as a reminder for the admin to look at it and remove those inactive moderators.