How did he scam you out of your account? If you are claiming it is because he neg trusted you then he did not scam you.
Also I bought an account that had PMs with you agreeing to trade feedback without any trade actually taking place.
He probably means the accounts are useless now as they can't be used for spamming sig campaigns. Most sig campaigns don't allow accounts with negative feedback, right?
That second part of your post is interesting. More details?
The accounts in question have since been sold and I decline to say if i deleted the feedback or not. However I have seen evidence that candy was exchanging trust when trades were not actually taking place and was telling people to be sure to leave the "risked bitcoin" at values that are not zero.
There were PM's in the account that would detail what to say in the feedback left and the amount to say was risked. It was clear to me that there was no actual trade taking place.