So is he advocating a zero-growth economic model?
Basically. And if all the gold in the world is economically accounted for, well, the rest of the world is fucked, since there's not nearly enough gold in the world to cover a global economy.
There are other humongous flaws in his ideals. If even just the US returned to a gold standard, well, where would we get the gold? We sold it all off decades ago. So we'd have to accept trillions more dollars in debt to buy gold to "fix" our economy. Remember, a global economy means no reset button. In short, fiat or commodity-based, our economy is tauntaun fucked.