alt Hacker NewsIt's more of a loss for the USA, which IMO is the unwritten point of the article.
France upgraded their gold bars to a new standard and as they were doing that, gold has appreciated massively in price, so France has the new shiny easier to trade bars, and the USA has the old harder to trade bars.
They can be melted and brought to the modern standard, which is what they did with the rest of their holdings on the old continent. They sold these only because it was cheaper than transporting it.