He also doesn't mention that vehicles will tend to charge overnight, and at that point the amount of electricity from fossil fuels is a lot lower.

https://www.eia.gov/todayinenergy/detail.php?id=16851#tabs_S....

As wind generation expands with falling costs, particularly offshore, that's likely to fall significantly within the lifetime of a vehicle bought today.

Also even if the carbon emissions are the same, there is a large benefit in shifting particulate matter and NOx pollution out of cities.