It's like the obstruction rule Ralth, the Warriors got hammered all year with incorrect rulings. But we were happy when they got it right, by the definition of the coaches agreement with the referees boss, in the Manly-Warriors game. Yes, they'd got that play wrong previously in the year, notably Bill Harrigan allowing a Jarryd Hayne try, and Steve Nash disallowing Wade McKinnon against the Cowboys, and Chris Ward denying Nathan Fien against Souths earlier this year... they got all those wrong, as they got previous Penalty Try situations wrong. But they got this one right.
The reason there's so much dispute is because of the confusion caused by some of the previous injustices. But when the letter of the law is there in black and white provided earlier in this thread as per the rule books, and you can then see why the decision was made, move along. No dispute, penalty try.