Nuking a user means that a mod can, with a single click, delete all user's messages and ban him immediately.
But it only works on newbies.
What does it mean?
From what you wrote, I imagine that nuke is only applied for newbies by moderators and above; or nuke is applied for all ranks but moderators are only allowed to nuke newbies and for higher ranks only global moderators or admins can nuke them.
Can you clarify my question, please.