I recently asked "Does the producer demand to have the trick explained before hand, privately?", where it was confirmed there is a screening process for the show in which the contestant magician must explain the trick to a "3rd party" magician, Johnny Thompson, who verifies whether or not Penn & Teller have been fooled in case of dispute, and presumably ensures that the trick follows the shows guidelines.
I think it's against the rules to plant assistants in the audience and then pick them at "random" on the show.
Interestingly, my original reason for asking the question I linked above was to learn whether the "random" audience member in Nick Einhorn's P&T:FU performance could have been a plant. Since the answer to my question was "Yes, there's a guy working for P&T who verifies the trick before hand.", I came to the conclusion "Wow, that was a legit trick."
However, I later heard (in a YouTube comment) that the "random" audience members in Nick Einhorn's trick were later discovered to have been his assistants, and Pen and Teller nullified his award for fooling them. My source is far from reliable, but that does seem like a rather specific rumor to just make up.
So, if the details in #1, #2, & #3 are accurate, it doesn't make sense to me how Nick Einhorn's trick could have made it past the screening process.
Are those points each accurate, and if so:
How did he get on the show if he had to explain his trick to a magician before hand who would verify that it could be used on the show?