I'm not a usaian so I might be missing something but isn't the most radical thing this guy has said something like: "I think people who have literally too much money to spend should have too much money to spend (smaller) so we can feed people and give them medical care"?
Does the mayor of new york even have the power to move on that? I would've assumed they like direct bureaucracy providing infrastructure and chair council meetings and shit.
It's pretty cringe to see handwringing over this guy make it all the way over the Pacific. He's a mayoral candidate, for people outside his council area or whatever isn't this a huge nothingburger?