That's different in the NFL, right? And, yes, you are correct about 4th down. In the NFL I think it applies to the 2-minute warning periods on any down and otherwise on 4th down.No, that's if you fumble forward and the ball goes out of bounds. In that instance it is returned to the point of the fumble.
If you forward fumble and recover, you get to keep the yardage. There may be an exception for fourth down.
But this case was a QB fumbling.. and I have to say, it almost looked like it came out like an interrupted shovel pass.