I understand that the minority are saying. But I need to ask where the forward progress was stopped? When he got the ball and started running backwards, or when the defender touched him?
To extrapolate to similar example. QB in the pocket and sees a rush. He starts dancing around and backing up to avoid the defenders, but ultimately is sacked for a 12 yard loss. Do we spot it where he started backwards, or was brought down.
If your forward spot is the contact from the defender, I can at least see the argument, since the example above with someone on the QB with the QB trying to dodge and run (even if with only minor contact) might be enough to say that the forward progress was stopped at a particular spot.