"A light meter is only a guide. It shouldnt be used literally. When I decided to tone down the strobe, we made it even with the natural light rather than being a stop over. Then we went a stop or two under the natural light. I liked the way things looked when they were barely lit. The darker pictures seemed refined, mysterious."
If ambient was 1/125 at F/8 then flash was dialed in to the same exposure, ...' we made it even with the natural light..'
Then the flash was dialed down F/5.6 or f/4, '..we went a stop or two under the natural light..'
Let's be honest here, I've read the same thing about Annie Leibovitz. "Assistants do everything, all she does is click the shutter"....
Coincidence? I think not.
You're heard that same comment because it's been witnessed on many occasions and there is no coincidence.
Develop a 'look' = formula to lighting setup = lead assistant learns the look = other assistants set up the look guided by lead assistant = crew see A.L. walk in to click shutter and do little else.
Stylists, camera tech, post production assistants all know the look and repeat the work. Emphasis on post production to maintain look.
Many, many of her assistants could show you her look if you asked because that's all they learned for her. And yes many of them went on to become successful, talented photographers after working for her. That's true for many assistants of damn near every well known photographer.