See this revision list. Jason (who is a diamond moderator) added status-completed tag then half hour later changed to status-reproduced removing the the status-completed tag, probably after realizing it was not yet fixed.
16 hours passed, and this user (who does not have any diamond) added the status-completed again:
Quick look in his main account revealed he is Stack Exchange employee but still, I was under the impression that diamond = moderator powers.
So, can moderator status be applied without diamond? Or certain users can get certain powers?