Of course I have. When the player is actually moving FORWARD. The key to FORWARD progress is having some FORWARD motion. When the offensive player is running backward on his own then he doesn't get to claim any forward progress.
First of all forward progress means "the most forward position the runner reached"; he does not need to be moving forward.
Stone ran back to the one, which is where Dam made contact and pushed him into the end zone. A player can attempt to avoid being tackled without being judged to have reestablished forward position (which would be the case if he escaped and then tried to make a play). Stone's forward progress was judged to be the position where Dam made contact.
I know I'll sound crazy saying this but the officials know more about the rules (and the accepted interpretations of them) than pretty much anyone on a message board.