Look closely at the pixel method.
Forget the pixel method, Old Akro, I suggest it would be too erroneous. Just look at the impact marks diagram and associated analysis.
There is no basis to suggest that he stopped flying.
I believe there is a basis, Old Akro - the pilot's leg giving out. And I believe that is what the ATSB are getting at. When that happened, the aircraft would have gone into a situation of increased drag, reduced lift and reduced thrust - all of which made continued climb impossible.