My understanding is that electric cars are still better on average, even if any given electric car may end up being worse for GHG emissions over its lifetime than a given diesel car. What matters, at least at national policy level, is the aggregate: you could expect to reduce GHG emissions overall by roughly half (albeit significantly varying depending on country) if all drivers switched to electric vehicles. See eg
https://ourworldindata.org/travel-carbon-footprint
In the long run it's better still to use public transport where possible, and therefore for countries to invest in it. But electric cars are still a step in the right direction, in particular as private transport can't (and arguably shouldn't) be eradicated entirely.
It's probably also worth pointing out that Atkinson's piece has had to undergo several revisions to correct errors he made. Overall, I feel it has a tone of "letting the perfect be the enemy of the good": he's correct in the sense that EVs are hardly the "solution", but they are still part of it.