TXMike is on point as there is no momentum exception applicable here, and as the R announced, the player went down on his own and was not tackled. I believe that the corrected spot should have been approximately the 2 yard line. IMO it was immaterial as the game then ended with the QB kneeing it out. Not sure why the visible wing official is holding a spot at the 5 yard line where they originally spotted the ball, since as previously noted this is not a forward progress spot or momentum exception case.