I can see both sides to this one.
Clearly in this case the Refs felt that there was so much distance between where Hodges was running and the defender who the decoy runner ran at, or because the defenders were not impeded, that there was no advantage gained in running behind the decoy runner.
I think the people who have said it was 50/50 (and you need to look at the actual circumstances and where the players were and what they were doing in this particular case, not apply some generic or out of date rule of thumb t it) are probably right. If it happened mid-field and nothing came of it, no-one cares too much, but when a try is scored like that, it's bound to upset at least 50% of the fans.