You are promoting what is pretty clearly a ponzi that is being deceptive about how they make their money. Not only that but you still have the signature up that caused you to receive negative trust.
If you are really concerned about your reputation, then I would suggest that you stop promoting what is clearly a scam
He does have a disclaimer at the start! I see no problem with this signature. If he removed it, he would seem weak on the forum and he is remaining with his own opinion! Do you have a problem with people having their own opinion and remaining with it Quick Seller?
Furthermore, he could possibly add a brackets after the use at your own risk which says "Suspected Ponzi" so that people know that it may be a ponzi!
LOL what? There is nothing in his signature that is an opinion. He is/was selling an advertisement and what he was advertising was clearly a scam. The disclaimer said nothing about that site being a scam.