Have nc'd for this as it's outing when compared to my other posts.
Back in the 90s, I was heavily involved in the squat/free party scene and met a lot of parents like this and a lot of adults who had been brought up like this in the 70s.
There are a number of ways it goes ... you end up with uncontrollable kids who have no idea about boundaries or social behaviour (we had a lot of problems with theft, damage, and antisocial behaviour by children under 16), you end up with children that do not understand where they fit in the world or how to operate in it (these end up being very troubled souls), or you end up with adult children that resent you because they have to spend their 20s and 30s trying to get up to speed with everyone else in their age group.
It's probably worth pointing out that if people in the squat party scene found these parents' kids unbearable, it really says something.
The only way it works is if you go properly off-grid and bring your children up in a "homesteading" style, which, of course, involves them learning a lot of practical skills from a very early age a bit like the Amish but without the whole Christian aspect or you incorporate free-thinking attitudes with the existing state and cultural structure (so you do "hippy" but your kids go to school, get GP check-ups and are expected to adhere to social conventions), or you are fairly strict about behaviour, attitude and learning etc while outside of the existing state and cultural structure.
What you can't do is do "hippy", pull out of all existing social, cultural and state conventions and structures, and not replace them with the acquisition of any "hard" skills, while living in a fairly urban environment.
It made me laugh though when I read about their goal to go to Costa Rica and become self-sustainable. Do they realise how much work it is to go self-sustainable outside of a larger community context and access to a significant acreage of land? I know people that started it in the 70s and persevered for years, with livestock, chickens, orchards ... it's unbelievably hard work and even then, you still need to buy bread, soap, fabric and oil etc, which means someone has to earn money somehow.
These two are very delusional.