Satoshi himself can’t really do much anymore. He can update the code but you need to have the majority accept it and run the nodes and miners to switch over.

This is the reason why it took forever to get segwit activated, it was very controversial at the time and many refused to signal that they allow the segwit fork to happen.

So I doubt he will be able to double the supply, the chain would die pretty much. No miner would mine a chain that they knew would dump in value.