Sigh. Judging from the very dramatic flight path, it looks like he was pulling some maneuvers that put the plane in a very stressful state. The way the last bit where it goes back and fourth in a straight line before it goes forward to the end, would that be him looping the plane?
I don't know if there are enough data points and resolution to determine exact maneuvers. Perhaps he
had a GPS logging data, they might find that.
Looking at it all it's clear he was having a good time out there in that final hour at least.