FWIW, the book synopsis that you quoted does not say that libertarians built a tent city, it says that freedom-loving citizens built a tent city. New Hampshire’s state motto is “live free or die”, and that value of freedom is one of the reasons that NH was chosen by the libertarians to build their utopia.

It’s a very rich and complex story about many different people, and arguing with a handful of sentence fragments from a summary does nothing to impugn the quality of the journalism.