theymos ensured satoshis forum account cant be hacked. by putting it into a perma-ban status
so no one not even the original user of the account can ever use it again

signing  a transaction from a known utxo spend of satoshi (EG the one he sent to hal and got change back) would be true proof.
but we all know CSW never was satoshi. so no point even asking or waiting for such

best to move on and forget CSW existence. just talking about him is more fame than he deserves.