The numbers for Australia in that video are sad, emissions there are predominantly on electricity production due to the use of coal.
In Canada, outside of Alberta, the emissions story is very different, transportation is the majority of emissions.
Ontario : the average emissions for the overnight electricity that goes into my EV's is 10g/kWh
Ohio average is 50x greater for their electricity production to power EV's, so yes, where you live matters
Even with 50x emissions, EV in US is better than regular gas car of same size/capability, and then is much much much better in places like Quebec and Ontario (and Manitoba, and BC) where electricity is very low in CO2.