We don't know that until the boxes are examined, he f**ked up no doubt about it, and he was cutting corners, humans do, but other factors could have come into play in any glide, weather particularly, there was heavy rain/thunderstorms in the area, so severe icing perhaps, a storm downdraught even, could have added to the issues they had already created by not refuelling.
At the end of the day he was clearly incompetent on this flight, with an eye on costs, but I doubt he wanted to kill himself and 70 others either, so I'm happy to see the full report come out, and see if there were any further extenuating circumstances.