There are two things involved: CO2 emission inherent in operation and construction, and CO2 emission that just happens to be occurring today because of how the materials and electricity are presently generated.

The anti-EV argument is deliberate confusion of the former with the latter.

There is no inherent CO2 emission required in construction and operation of an electric car. This is unlike gasoline powered cars, where petroleum has to be involved in their fueling.

From a policy point of view, an EV that replaces a gasoline car is a good thing, even if there is at the moment some CO2 emission in the construction and operation of the EV. It reduces CO2 emission in the near term, while also pushing EVs down their experience curves to enable total replacement (and abolition of CO2 emission) in the far term.