The Flight Aware ADSB information gives an altitude of around 6000 feet
which means, that the rapid change in air speed and altitude started several
thousand feet above the ground.
Take a look at their flight path and altitude, it shows nothing unsafe.
That is, it cannot be controlled flight into terrain.
I used to ride a motor bike around that area and don't recall any mountain peak
around there rising to 6000 feet.
Correct me if you know other wise but this accident appears to me to
be another catastrophic wing failure.