The article was written primarily with the UK in mind, remember. Certainly if you live in inner London (as opposed to the suburbs), and I suspect in most other big cities in the UK, it doesn't really make much sense to own a car -- I haven't for years -- that costs a small fortune to insure, garage and to park and which spends most of its time simply sitting idle and depreciating in value. It makes much more sense for me to take taxis everywhere (unless the tube or public transport is more convenient) and to hire a car when I need one.
Supermarket shops I do online anyway (and a lot more of my shopping) and I can easily supplement that with plenty of stores in walking distance.
If, as he suggests, self-driving electric cars come widely available and the cost of journeys falls dramatically, that simply makes ditching your car more attractive.
Something that really brought this home to me was, about 30 years ago now, a friend finally managed to settle his late father's not inconsiderable estate and marked this by buying the Jaguar car he'd always wanted. This he celebrated by taking me and several others out to dinner, and I was one of the lucky ones who got a ride in the Jag.
Anyway, he spent longer driving round London's Chinatown looking for somewhere to park than he'd spent getting there from his flat in one of the outer boroughs, then he couldn't drink during dinner because he was driving, and when we left the restaurant he found the parking fee was more than his dinner had cost.
That really decided me that a car in central London isn't a good idea.