Yeah definitely ... the best teams in the comp are the ones that realise they've lost the ruck and just hold down forever, because a six again off a slow ptb is better than conceding a try off a quick ptb, they'll be constantly offside on their goal line, etc.
They know the refs won't send them, because that would "ruin the spectacle"... and even if they did they know they aren't getting penalised with a man down, so they can just double and triple down on the slowing tactics anyway.
Good defence in NRL is basically just being fit as **** and cheating as much as possible, because eventually the ref will just stop giving penalties away.
Look at the titans season... they were absolute shithouse and getting flogged every game... then Dessie went full storm mode and they gave away like 30 penalties and six agains vs Canberra to lose by 1... their for and against has gone from -85 after 6 games to +15 in the following 10 games