Lowering the nose does not prevent you from stalling though.
The aircraft wings must be maneuvered into a position (proper angle of attack) to act as a downward deflector of air and generate lift. If that's not the case, the aircraft will fall out the sky and that's what you want to prevent in the first place.
I understand that many factors manifest in such a flight envelope, but the key is the relation of the wings with the air in terms of lift generation.
WP