What Happened to Y Combinator's New Cities Initiative?

I remember this from 2016: https://www.wired.com/2016/07/y-combinators-plan-build-new-city-not-actually-crazy/

https://cities.ycr.org/ is now an expired Squarespace page. I assume the project is no longer active. I'm interested in a postmortem, or any other details about what happened.