Drew do you have a problem with metagaming? The name of the person ordering was not Cyber Knight, so there is absolutely no way for Plastic Man or anyone on the team to know she ordered it.

If anyone was to ask Cyber if she ordered she would deny it, like how it is a "mysterious billionaire" funding the League. Batman would figure it out if he had cause to. I don't see any Batman types on the team capable of deducing that Cyber ordered the pizza.