I want to see blockchain gone but most legislators don't understand it, they think it should be gone but they are not sure why so they end up with nonsense like this.
A fiat currency is issued by a government without being backed by a physical commodity. El Salvador's adoption of Bitcoin does not make it a fiat currency.
I think this is in reference to a US law that states that a "currency" adopted by a foreign country is not classified as an asset but as a currency. This has tax implications but I don't know the details.