He's not wintrading. He saw that wintraders were using that pin in there battlecard and put it on himself. He didn't use the pin in game and was betrayed by the meg who was wintrading. If he was wintrading he would be using the pin in game and the meg would have not betrayed him.
I mean wintrading and teaming is bad but there are 2 options lose 12 throphies or try to sneak into the clan i mean thats better than losing so much trophies at least get 1 thropy