At least we all seem to be in agreement that even if he’d carried full fuel, the PIC was committed to a ditching somewhere if he couldn’t get into YSNF
Nothing is so black and white. Extra fuel also gives you more decision making time when thinking about peeling off to an alternate. It also makes the option of diverting look more attractive if you are going to reach your alternate with a good amount of fuel in tanks.
Fuel is marvellous for improving decision making.