I think you and other commenters are responding to the "solve it all at once argument" without it being put forward by the article.
The article does not claim that electric cards do not reduce emissions sufficiently to solve the problem of climate change all at once. It claims that electric cars increase emissions and that increasing emissions exacerbates the problem of climate change.
It's not saying that electric cars are only a partial solution. It's saying that they are part of the problem.
I read the article and felt it was kinda thin and conclusory.
I take a bit of issue at his swipe 'if you can afford them'. Since the price is falling fast enough that electric cars should be actually cheaper than gasoline ones within a few years. Which means we might end up with more electric cars than we would gasoline ones. So yeah some of the negative externalies are fixed, CO2 emissions and air pollution. But others are not, traffic fatalities and injuries, traffic congestion, industrial pollution, resource depletion. And low prices may mean more of the latter not less.
The article does not claim that electric cards do not reduce emissions sufficiently to solve the problem of climate change all at once. It claims that electric cars increase emissions and that increasing emissions exacerbates the problem of climate change.
It's not saying that electric cars are only a partial solution. It's saying that they are part of the problem.