Sorry for your loss! It's a terrible feeling when it happens. I had my P3a crash and it's a sickening feeling. I don't have any experience with analyzing the flight data but after watching your video, my first thought was that it hit a bird. The flight is smooth and controlled but the change to the tumbling out of control is so sudden, to me it strongly suggests hitting a bird. When mine crashed in a tall tree, the video looked like yours when the props hit the tree foliage... instant tumbling. No swaying, swirling, gyrating or accelerated elevation drop in an upright view... just sudden tumbling. That's my opinion.
@teaman thx for your opinion, you could be right.