As they point out, the paper is not anonymous. It is pseudonymous. "Satoshi" is a person or persons whose communications are validated through a public key (Qan

As they point out, the paper is not anonymous. It is pseudonymous. "Satoshi" is a person or persons whose communications are validated through a public key (Qanon folks take note). Anyone claiming to be Satoshi can simply sign something with the associated private key and prove they were involved with the identity.