The most telling aspect of this is not the 10% power drop but the massive torque drop at lower RPMs. That indicates that VW is limiting turbo boost at low RPMs

The most telling aspect of this is not the 10% power drop but the massive torque drop at lower RPMs. That indicates that VW is limiting turbo boost at low RPMs while in this mode. That makes sense, as increasing turbo boost increases pressure, which increases combustion temps, which increases NOx production.