To do what he said - travel 100km in 0.1 seconds - would take 203kG. You can't determine the level of thrust required without knowing the mass of his vehicle.
To do what he meant (but failed to write) - accelerate to 100km/h - would take just 170G. Not 10,000.
It's unlikely the human body would survive, although I doubt it's been fairly tested!
But in this case he only felt it for a split second.
If we pretend in LFS the car would actually have been shot in the air by a barrier, the driver's feeling it for a much longer time, and not to forget, the massive impact into the ground again.