I have never worked in a studio, but I know from experience that Lee knows what he's talking about.
And, incident metering works all the time, regardless of what the lighting is. The key is to meter at the object, pointing the dome to the camera lens opening general direction. The idea is that your meter should see the light that your camera lens is photographing.
It doesn't matter if the object is very bright, very dark, or if it's all mid-tones; the tones will be rendered correctly if you meter this way.