Firstly the story of baggage coming out of the plane and causing it to crash is bull**it!
The aircraft had no passengers on board!
In my humble opinion the pilot wanted to have a bit of fun (since he had just gone online) and probably tried some aerobatic maneuver
A C210 can do a barrel roll, if flown correctly at positive G, but an ordinary pilot with no aerobatic training is asking for trouble if he attempts such a maneuver
.
Anyway, all speculation. The investigation will hopefully find the cause of this tragedy!