Chances are, the dealer did their investigating, but that ad. doesn't really prove anything. All that comes out of it is that the shoot/show and the listing site became associated with the seller's boil over.
What if a spring or firing pin broke. It would've been a much lesser cost, but whose fault would it have been. At the moment, the seller would've probably been disappointed because the gun would have been off the market, even if temporarily.
It's a tough one. Only two got to shoot the gun? They were probably 'regulars' who were well known to the seller. Even if somewhat over pressure, chances are only target loads were readily available around a clays course. The gun looks refinished, is this the instance to not automatically assume an obstruction and not wonder about barrel thickness in the area.
