The judge has guidelines which provide a range, but the prosecution and defence can also make submissions. There are also victim impact statements, but I don't know how much credence is given to those by the judge when making his/her decision. The defendant in that case was a career criminal, a member of an organised crime gang, who took a machine gun to a pub on Christmas Eve and sprayed bullets indiscriminately at a group of people standing outside, killing one and injuring 5 others. I agree that it doesn't seem to meet the elements required for a WLO but one can hope!
I wonder if he will have the balls to attend court for his sentencing!