As I understand it, he's using this analogy to explain the bitcoin rate halving, but this isn't what's happening in the bitcoin economy at all. It's the rate of supply of new bitcoins that will be halved while mining equipment costs are going down. This might mean more miners will hop on board but there's a separate equilibrium here that governed by difficulty adjustments. Price will still be dependent upon how well people make use of the protocol Satoshi created.
You are right, but I tend to read over those mistakes and ignore them, cherishing the times when they get it mostly right though.