Chatbox assistants shouldn't have any powers like that, it would defeat the purpose of them moderating the chatbox if they also could moderate the forum.
The ex staff part is understandable but then that's like giving mod abilities to a non mod. Also, if you could "edit it out" i'm sure the phisher could edit it back in, leaving you with only the option of locking topics or deleting them.
but before you say why not give those powers instead.. What if the phisher makes multiple threads? it'll just be a war between you and the guy and the end point is banning them.
I mean I wouldn't mind tbh but yeah most people wouldn't be easily baited by a suspicious link with a retarded caption saying "get free bonds"