The article makes the point that EV battery capacity is small compared to the size of the grid. So I can reason from the article that charging EV’s has a small impact on grid capacity!
Don't conflate "battery capacity" which is storage, with "grid capacity" which is current. EV owners operate by the ABC rule: Always Be Charging.
In the 7 months I've owned an EV and driven in 17K miles, I've needed on average 25kWh per day to charge it (including burst times like charging it rapidly on the road during trips). For reference, my old home A/C pulled 4 kW when it ran. So 25kWh per day would be like adding a 2nd A/C unit to my house to run 6 hours per day. If every home did that the grid demand would be huge, especially when they tell us every summer that they need folks to not run the A/C as much as we already do.
That's not even getting into the demand from Dims that it all be done with only "renewable" energy, whatever that is.
And further, you have to recharge those vehicles. Until such time they will be useless.