This is categorically false - the average rule has been in place for at least the last few seasons. They reason it's more evident this year is because one team has forfeited several consecutive games.
I assume that you have misremembered what occurred over the last 2 seasons but to ensure that an accurate record is found on this forum I will post the facts. For scores in 2017 see NSWRL live, for 2016 see leaguenet.
19/8/2017 SS Mounties received forfeit from Asquith - awarded 36-0
279 points in other 5 games so if average result per 2018 had applied it would have been 28-0
28/8/2016 RMC CBW received forfeit from Kingsgrove - awarded 30-0
234 points scored in 5 other games so if 2018 method had applied it would have been 23-0
26/8/2016 SS Belrose received forfeit from Peninsula - awarded 30-0
360 points scored in other 6 games so 2018 method flukes same result
20/8/2016 SS Guildford received forfeit from Mounties - awarded 30-0
391 points scored in other 6 games so if 2018 method had applied it would have been 33-0
3 forfeits in the space of 8 days.
6/8/2016 SS Windsor received forfeit from Blacktown - awarded 30-0
342 points scored in other 6 games so if 2018 method had been applied it would have been 29-0
Coach latilupe was sacked by Blacktown during the week so the players withdrew in protest.
4/6/2016 SS Guildford received forfeit from Asquith - awarded 30-0
349 points scored in other 6 games so if 2018 method applied it would have been 29-0
The previous week Asquith lost 90-10 to Auburn so the club withdrew for a week and then resumed and suffered many floggings but managed to beat Cabra and played every other game and ended with NEGATIVE 1137 points differential.
17/4/2016 SS East Campbelltown forfeited to St Marys - awarded 30-0
362 points scored in other 6 games so 2018 method flukes same result
The doctor did not arrive at Waminda. St Marys waited half an hour at which point the game was declared a forfeit. East Campbelltown won the premiership from 5th place.