In the WEF's own words — this rearrangement of cities is absolutely about climate change:
As climate change and global conflict cause shocks and stresses at faster intervals and increasing severity, the 15-minute city will become even more critical.
And the solution was the pandemic (they really say that):
The obvious, yet incomplete, answer is the pandemic…. with COVID-19 and its variants keeping everyone home (or closer to home than usual), the 15-minute city went from a "nice-to-have" to a rallying cry. Meeting all of one's needs within a walking, biking or transit distance was suddenly a matter of life and death.
And then the dark hand of the totalitarian managers appears, as James Woudhuysen, warned in Spiked in late October:
The green agenda is taking inspiration from the illiberal days of lockdown.
To this end, Oxfordshire County Council, which is run by Labour, the Liberal Democrats and the Green Party, wants to divide the city of Oxford into six '15 minute' districts. In these districts, it is said, most household essentials will be accessible by a quarter-of-an-hour walk or bike ride, and so residents will have no need for a car.
On the surface, these 15-minute neigbourhoods might sound pleasant and convenient. But there is a coercive edge. The council plans to cut car use and traffic congestion by placing strict rules on car journeys.