A three lane road and the fact that half a dozen drivers managed to run over a pedestrian before they could stop suggests high speed.
A body hit by 6 cars at high speed is going to be pretty unpleasant.
The engine bay/wheel arches could be full of all kinds of ‘bits’. Putting the car back to the state where it’s no longer a potential biohazard could mean dismantling everything in the engine bay, removing all the wheels and arches, removing the entire suspension and exhuast systems to be cleaned, inspected, replaced if necessary and reassembled.
That’s not going to be cheap.
Probably explains why all the following drivers failed to spot a body in the road, and they still can’t find all the bits…