But here if they can post signatures, then they will be able to calculate Satoshi's block #0 address' private key 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa and that means that the creator of the OP list has Satoshi's private key.
Creating a random address then signing a message from it doesn't mean anything at all. People are doing it every single day (200k transactions per day are doing that). Maybe you should try reading that topic and understand the explanations given by others on how starer tried fooling those who don't understand how bitcoin works.