Even if a given EV uses electricity produced by as much fossil fuel as it would have taken to fuel an equivalent ICE car, it's a win because a fossil fuel burning electric plant on the grid is stationary. An ICE car moves.

With the ICE car, any equipment you add to try to capture emissions adds to the weight of the car, in turn making it burn more fuel, and you are also limited in the total weight that the car can have and still drive safely (or at all). You've also got space limitations.

With the stationary power plant, by picking a place with sufficient space there are no weight limits on how much emission capturing equipment you can add to the plant.