"I know that when I think of a good place to go on holiday, I always search for the most authoritarian theocratic dictatorship in the World."
This is an example of what I call Muskification. Grand projects or technological advancements that are clearly ridiculous, but somehow fool the poorly educated masses and even attract investment from some quarters (where people have more money than sense). As usual, timelines presented are fantastical. The phrase 'next year' - especially when stated with a thoughtful and serious countenance - has become one of the great Muskisms of our age, so it is nice to see it also being utilised with respect to the linear city. I hope they don't forget to include a decent public space for judicial beheadings.
File this idea away with robotaxis, space hotels, hyperloops ("air hockey tables" in a vacuum), centrifugal slingshot satellite launches, Mars landings, NFTs and medical testing machines that perform hundreds of tests on a finger prick of blood.