Rule 9-2-1a penalty: "Unsportsmanlike conduct. Live-ball fouls by players: 15 yards. Live-ball fouls by non-players and all dead-ball fouls: 15 yards from succeeding spot."
Since the call was on Harlan, a non-player, the play is allowed to complete and then the penalty is enforced on the "succeeding spot." The TD would stand and the penalty would be enforced on the extra point.
I believe there would not be an untimed kickoff because of "ARTICLE 3. a. A period shall be extended for an untimed down if one or more of the following occurs during a down in which time expires (A.R. 3-2-3-I-VIII): 1. A penalty is accepted for a live-ball foul(s) " but there's the following exception to that: "c. If a touchdown is scored during a down in which time expires, the period is extended for the try".
There would be 15 yards assessed on the extra point, which would not be kicked because the lead would be insurmountable.
Anyways, I'm glad they didn't score.