He literally said "for the production of the battery". Don't build a strawman. It's pretty well accepted that batteries are environmentally dirty to make.

An ICE drivetrain and electric drivetrain sans motor are both big lumps of metal. I'm not sure what the difference is between the carbon footprint per pound of copper vs steel (both cars are gonna have a lot of aluminum but I'm assuming they're within an order of magnitude of even). In either case the manufacturing carbon footprint it pennies compared to the energy required to move the damn thing its whole life (except in the obvious case of the electric an in an area where electricity is low/zero cabon).

I suspect the EV is going to be just barely more carbon heavy to manufacture simply because tech is at a point where the EV needs to place a much higher priority on weight (because it has the heavy battery to compensate for by being light everywhere else and reducing weight increases range) and that priority will result in different part choices throughout the car and that is where the extra carbon will come from (e.g. forged aluminum control arms and rims vs stamped steel).

Obviously the EV is far superior to the ICE vehicle in operation so it would make that back quickly.