Until tonight, the rule for overturning a call on the field required "indisputable video evidence." Tonight, the call was reversed without video evidence of THE BALL advancing for a first down. There was no video evidence of the ball crossing the first down line.
if you go read the rule it doesn't reference the ball advancing for a first down. Indisputable evidence could be the player holding the ball's advancement past the first down marker.
it just says indisputable evidence.. does not reference the ball as part of indisputable evidence.