Anthony-- Kudos to you for keeping the negative mark on his once untarnished record!
It never made sense how this guy continuously maintained his 100% positive feedback. Your case certainly shed light on it-- with other naive buyers unaware that they had bought fakes (again, basing their choice to buy on his stellar feedback).
I think you were right to amend your wording to speak about your poster alone, since that is what feedback is about-- one's individual dealings with a seller. Even if tloc sells 10 authentic posters out of 1000, your initial, blanket statement would still be untrue. That being said-- you did great!
The idea for others to buy his fakes and then leave neg feedback sounds brilliant, too Let the buying begin!
Jeff