Gigem:
I didn't see it when it happened. The OU radio announcers, after the game, talked through a replay they were watching. Maybe it's the same replay that's in that Tweet. As they explained it, when the ball is spotted, players need to be between the numbers. On that video clip, you can't see where the WR Sategna (#5) is when the ball is spotted. But the numbers where he should be are not in the frame.
Hugh Frieze obviously thinks it was an illegal play, and it may have been an illegal play. I suspect that we have not heard the last of this.