Here is the thing, you can never know if two users here are the same user. If they stated they are different users and were found out to be the same, that would be different that would be a lie. But I have yet to see QS state that he is or is not Panthers52. He never told the buyer that they were different people. Caveat Emptor.
You are saying that the buyer getting deceived is fine, as QS didn't say or do or mention something? Basically, you are supporting this action on a technicality but are oblivious to the morality of it?
You are willing to trust and back a person who is trying to use some loophole to deceive someone else?