Since the seller clearly ( ) states " trumps any and all PMs" I took that to mean any discussions via PM, while you take it to mean any via PM.
Since that portion of the description is not clear it's up to interpretation.
What is clear is that the seller did not specify that an " on the thread" trumps all other posts, so any by default trumps all...it trumps discussions, and it definitely trumps any other whether by PM or on the thread.
Furthermore, the seller himself (who is the QB of his own thread) gave it the gold stamp of approval when he stated to Green that the item was Sold!