.
Engine was a turbine so yes, they damn near fell like a rock.
I am not qualified in a flopper, but I think you will find that the engine type has little to do with auto-rotation.
It is also likely, from eye witness descriptions that he did not go to auto-rotation because he had enough power to make a controlled landing.
All the more reason that lack of floats was foolish and in a civil court will probably cost someone a lot of money.