You could class it as an organisational accident IF it happened immediately after they changed from 300s to 58s and didn't remark the landing pads. That would be reasonable mitigation for the pilot who would have expectations that the new aircraft were introduced into a 'safe' working environment.
However, it is quite clear that they were operating for some time in this condition and had probably had the discussion about it in safety meetings eg Hey, we still haven't changed the pad layout and these helos are much bigger than the last ones'.
Call it laziness, lack of awareness or whatever you want but the reason that accident happened was poor piloting.
If you want real safety as opposed to paper safety, we need to get away from the culture of 'making excuses' for an accident which is clearly someone's fault (for whatever reason.)