no, he was talking about there being three different settings for the three different phases of the corner.
during friday and saturday sessions they will gather data to find optimum diff settings for the different corners. then during the race all three settings will be controled by a single knob. you can sometimes see drivers fiddle with the diff knob during in-car shots in the race. (you also sometimes see them letting go of the wheel with one hand to adjust the brake bias setting -- which for some reason is often not on the wheel)
during friday and saturday sessions they will gather data to find optimum diff settings for the different corners. then during the race all three settings will be controled by a single knob. you can sometimes see drivers fiddle with the diff knob during in-car shots in the race. (you also sometimes see them letting go of the wheel with one hand to adjust the brake bias setting -- which for some reason is often not on the wheel)