I just signed up on Club WPT for grins & giggles. It looks like they use exactly the same software as UB. Does this mean that "our friend" could use his backdoor access to look at everyone's hole cards on this site too?

No, I'm not worried about somebody winning 700k play chips or cheating me out of a trip in a freeroll. I'm just curious if the backdoor is vendor specific or universal.