i saw an amateur film of a rally in poland and a car hitting a concrete pole sideways as indicated in this, OK they have a cage and may be seam welded, but the force required to rip the front from the back would be incredibly difficult to replicate. Without a significant weight in the back the side impact as shown would a) stop it dead in its tracks, the deformation of the body shell absorbing much of the impact.
b) spin the car , engine bay first off the tree as that is where the weight is, it has the ultimate momentum here, imagine a tennis ball it a sock hitting the same tree sideways.
There simply is not enough mass behind the driver to rip off the back of the car. unless there was a serious defect with the chassis or its a chopped, welded dodgy car.
more obvious is the distinct lack of damage to the earth around.
i.e. none.
looks fishy