I would look at this conundrum this way. Much like a dead ball award or a 'home run', the baserunners are required to run the bases properly'. If not, the defense has the ability to make a proper dead ball appeal (of course, this would be very interesting to see pulled off in 8u
)
I think the PU made his award (which was home) and was right for sticking to it. (what the runner (re touching home) did after calling time is not relevant as the ball is dead)