I think they were trying to say that every individual who uses their car less is an improvement.
I live outside Boston, which has among the best transit in the US but it doesn’t take me everywhere. My town is quite walkable but also hilly and with weather. I do choose to walk, or ride the train when I can, but I still need a car. Improving this enough for most prople to dispense with cars will be a very long time. In the meantime, my use of EV, walk, train is a huge improvement of my brother in the Midwest using ICE car for everything