This guy is an idiot.
He actually said this.
the idea is to make something unforgeable as cheaply as possible. This is why all modern currencies are fiat currencies instead of being made out of gold.
Currencies aren't fiat instead of gold because of forgery. To make such an asinine and ill-informed statement says to me this guy don't have a clue.
Are you sure? I always figured that we used paper money (and database entries) because it takes a lot of work to print a dollar bill, while counterfeiting gold only requires that you find another metal with the same color, density, specific heat and electrical resistance. How hard could that be?