I don't know how you think this is different, all he is saying is that if they are in position and know the foul occurred in the field of play, then they'll throw the flag and assess a live ball foul and take the TD away. This is what we were told as well. What isn't said is that if we're not sure, then err on the side of dead ball, but that philosophy is the same for personal fouls near the end of a play.
Hopefully it won't be controversial the first time it happens. We take away touchdowns all the time, they will eventually get over the fact that a UNS will just be another one of those times.