I mean, yes it kinda is. fiat currency isnt tied to anything tangible, except to the general faith in the system by its users.
Even the concept of debt is somewhat amorphous and made up , cause nothing will happen if we dont pay back the owed amount to the federal reserve. They dont have an enforcement wing. Though debt to holders of bonds is a real thing.
But it is worth noting that even though all the govts on earth are using imaginary money, the idea of scarcity of this imaginary resource is a real thing. If the Bank of England is printing less of its imaginary money than we do , then the value of our imaginary printed money is lowered, making it difficult for us to trade our infinite money for their infinite money. You see this play out in places like zimbabawe where they took your concept of infinte printed money too seriously and destroyed the value of their imaginary money relative to every other country’s imaginary money.