JoelKatz is of course correct 100% in this argument. And I can base this conclusion on a very simple reasoning, the basics of contract law.

A contract is only valid when both parties have entered it willingly and while fully informed of all the relevant information and facts. For example, A offers for sale a Rolex watch to B while A knows that it is a fake and B does not, even if all other requirements for the contract are met such as offer acceptance and consideration, even if A offered the Rolex and B accepted it and paid for it. And even if the contract has a clause like "if a party to the contract does not understand all the terms of the contract, the contract is valid anyway" it changes nothing. The moment it is found out that the Rolex is fake, the contract is off and in fact it is not not a contract it is fraud.

Deeplink, you are telling people: "it is your fault that you have bought this fake Rolex, nothing you can do  now about it, hahaha".