No, it is because if you peg your money to a real resource (be it gold, oil, carbon, or entropy) you allow society to potentially generate credit claims to more real resources than can actually exist (and, based on past experience, this potentiality will eventually be realised) which is then followed by a debt-deflation cycle when the bubble pops.

Fiat money allows such nonsense to be inflated away (which is why inflation-indexed debt is as systemically risky as especie pegs).

If you are not convinced, try it on someone who has not been entirely debauched by economics. — Piero Sraffa