On the topic of the article, I think the general skill one needs to remain in control of technology is managing context - specifically the ability to keep your own context rather than letting technology define yours for you. An axe is still technology, as is a chainsaw - the key is operating tech so that it serves your own goals, rather than being lured and lulled by it into serving someone else's goals.
Taking on more physical tasks helps expand your context (as per the OP). Having a life and goals outside of computers helps. Setting your own criteria that are contrary to the surveillance industry's siren song helps (eg libre software). Having full-sized input/output devices helps. Having many devices for different purposes such that "time wasting mode" is explicit helps.
The thing I worry about with abstinence based approaches is that they don't teach the skills necessary to moderate your relationship with technology. So even though your context is larger, when you end up entering the technological context (which society will inevitably force you to do for some aspects of your life), you're still completely unprepared.
Looking at Midland's website I see the article's characterization is a bit myopic (there's a picture of a group setting up solar panels, and a picture of someone with a laptop). But I'm speaking more about this general theme of anti-technology that involves romanticizing an axe (seemingly minimum viable technology) rather than say a chainsaw (which gets useful work done without addicting you).
Supposedly the average student receives $48,000 in financial aid, so the average cost per year is $25,900, but that still makes this high school substantially more expensive than a highly prestigious college degree [2].
[0] https://midland-school.org/admissions/affording-midland/
[1] https://studentservices.stanford.edu/my-finances/tuition-fee...
[2]. https://financialaid.stanford.edu/undergrad/how/index.html
Really though, that's unfortunate. It seems like a really great experience but unavailable to most. I wonder what it would take to do this as a summer camp program without the liability of overnights. I would have loved something like this in my teens (also now in my much olders)