Yeah and he misunderstands that the “prices need to be stable” issue is circular. IF market goods are widely priced in a particular money, it literally creates stability to the currency. Because essentially every market product is adding to the liquidity of the money.
This is why Bitcoin will demolish gold. Nobody prices anything in gold because it isn’t a good currency in a digital world. Bitcoin is a protocol and there will be thousands of varying payments networks built on top of it.
On a long enough timeline bitcoin, simply due to being a software protocol, will inevitably outperform fiat on every metric. Because bitcoin will be globally priced, used as a pricing tool in every country in the world, and will be usable in exactly the same way in every country and on either side of any arbitrary border, bitcoin will be the most liquid money that has ever existed.