It is helpful that the author quantified some of the issues, however there are many factors involved:

* Does the authors CO2 estimates for battery production actually include "mining" or just "assembly"? From reading it, it seems to just include assembly of final components into a battery.

* Moving tons of rare-earth minerals from Point A to Point B for battery production requires yet more CO2 output.

* Wind + Solar still requires massive batteries somewhere, which still requires massive mining operations.

Further, with $40 shale oil now a reality, its getting harder to make the economic case.