It's not even clear to me that they lied. If someone claims the "true market value" of an asset is $X, and the owner accepts an offer of $X, then the market value of the asset is indeed $X, no?
A market cannot just be two people. If I sell you a brand new Rolex for $1, I would say I’m selling it to you at a discount from the market rate, because if I posted it on an open auction like eBay, I’d receive higher bids than $1.