Craig: "No message was signed, you can't sign anonymously - you have to have an identity to sign....key doesn't count"

Does he really know about how a digital signature work?

For who doesn't know about this case: Someone signed a message using the keys of some wallets Craig Wright used in court proceedings, saying they were owned by him.

https://gateway.ipfs.io/ipfs/QmWFr2UgfdeDngad8W8AEVejyQyW4FB...