Fifteen Minutes of Fame: What is the 15-minute city?

Am I missing something here? The article opens with

> a city where most or all amenities (grocery stores, pharmacies, entertainment, public services) are within a 15-minute walk or bike ride

and then spends the rest of the article talking as if you'd never leave those 15 miniute neighborhoods and that you have to work there too.

Feels like the author really doesn't agree with the concept but doesn't want to say so; their argument seems quite bad-faith to me.