>>Notice they start with "advance". Don't store your old camera with shutter cocked.<<
Nikons are pretty sturdy in that regard. Their shutter speeds stay pretty reliable even when stored cocked. In the pre-motor-drive era, this ad and ones like it were describing how easy is was to shoot photos in quick succession.
>>I wonder if he left out "adjust speed and aperture" on purpose?<<
When this ad appeared, every non-box camera required you to first adjust speed and aperture. It's only those of us stepping back from automation who consider this to be a learning curve ... for photographers in the '40s and '50s, it was how you made pictues ... you measured or judged the light, set the camera, then compose, focus, shoot (or focus, compose, shoot if you don't want to center your subject with the RF patch).