The reason he was only seeing his hole cards was that he was the one playing on the computer. If there was another player on the network that his software was monitoring (next door neighbor, for example) he could have been seeing them as well.
While what he was showing is still probably not allowed by Cereus, it is not illegal as it was his account, his network, and his player id he was hacking. If he had shown his software hacking other accounts there would be knocks on the door soon after... if there weren't already ("It's Annie Duke, WTF!")
