One more time I suppose ! The sensation of weight is actually the reaction to weight, so you feel you weigh something standing on the ground because you feel the reactive force from the ground to your feet balancing out mg. In level cruise ditto through your bum, the source of the force ultimately being the a/c lift via the seat cushion springs and all points in between rather than the elastic stress from the ground. In all cases no net acceleration. In AF 447, once steady downward speed attained, drag force is matching gee so again you would feel the upward force which in this case you might mistake for the consequences of a 1g matching lift.
While the a/c was accelerating downwards there would have been the sensation of reduced weight until tv achieved. Mixed in with the rolling motion and turbulence, not obvious how 'clear' these sensations would have been in terms of discerning the a/c dynamics.