I wonder why the bottom two sections are marked "storage." I would think the whole cabinet gets down to zero. Maybe the recommended procedure was to freeze quickly up top, then transfer to one of the lower compartments.
I may be in the market for a freezer soon. I'd like to find a vintage one, but have to say I'd rather see all of the contents when I open the door. I doubt that this Westinghouse system reduces the rate of frost accumulation by much, if any.