He didn’t fake it at all. Go watch the film. That said, man, that rule seems ripe for misinterpreting and improperly assessing. I've watched the clip from the two angles available and from what I see there was no huddle (I've seen several people claiming OU huddled without Sategna in it, this is just not true).
At no point did the refs ever hold the ball to imply a substitution was happening. Sategna walked to his spot in a mostly straight line - he didn't do any weird curve back to the bench and sneak back upfield or anything. He got to his spot, checked his lineup with the ref and then they snapped it.
According to the radio broadcast this was a play that OU practiced this week - was the practice then trying to fake a substitution or just setting up a sequence where Sategna would end one play outside the hashes and then just stay out there for the next play and hope he goes unnoticed (with an assist from Burks jawing at the defenders to try and take their attention away)? How do you differentiate between one of the other? Because he... Looked substitutiony as he moved to his spot?