Interestingly the photo on CBC shows the right tailplane folded under the tailcone and adjacent to the left tailplane. It's almost as if the aircraft hit tail first
If, as reported, there was a power line collision, that may have caused the tailplane to fold over.
NASA crash tested a number of flood damaged Navajo fuselages. Slow motion film showed the fuselage compressing vertically and inflicting head injuries on the dummy occupants, then springing back.