Stall recovery from what altitude? I betcha that plane needs over 1000’ to recover from a low-speed, single wing airfoil stall. Don’t KNOW that, but just guessing.
*IF* they stalled one wing on approach, they were in deep weeds, obviously.
I’ll agree it does look a lot like pilot error.
If the stall system had simply “pushed”, they would have had a chance; but when he yanked back, he put it in a spin. With that small tail and the torque on those engines - that was it...
Forgot to mention - they were at 1,500 ft AGL...