The authority may already know his true identity but decide to keep it secret. Personally, I believe in the "deep state" and they are not always carry ill-intent.
I doubt this very conspiracy theory, i believe if the the U.S government knows who Satoshi is, they would have made it public and tried to use it in one way or another to attack BTC and maybe discredit it. I say so because that is what they love to do, just as they are going after BTC through its privacy solutions and privacy enhancing wallets right now, claiming that they are all being used for money laundering.