At 1700ft/m and sudden impact I calculate it as being 23 g acting on the aircraft. Load on body would be less than that. Not an engineer so may have that wrong.
I am an engineer and I think you are wrong Mark.
Assuming the plane is coming down at 1700 ft/min or 520m/sec and if we assume it starts to decelerate 0.75m from the ground then I calculate you experience 5G (or a deceleration rate of 50m/s/s). I base the 0.75m on a rough estimate of the distance between ground and bottom for cockpit. For the individuals concerned it would be a little less as they have an extra 0.3m of seat slowing them up. Either way it is quite survivable.
Like others I'd like to to know why the engine stopped. The other recent example of a BRS operation was due to the pilot flying for 2 1/2 hours with low oil pressure. I hope the chutes are not encouraging poor judgement.