It's not that it has strictly to do with being outside or away from the computer (that's nice though) but for me it's that you still get to build and be proud of what you've done.
When I do work away from the computer and more in farm/homestead situations, I'm still drawn to using technology to solve problems (e.g. Automating certain tasks with microcontrollers), so it's not a rejection of my $job.
I think it's that I'm a builder and a problem solver at heart, I love finding issues, fixing them and being glad. Homestead is often that 100x.
Have to disagree with the article though, I don't think it has anything to do with a mythos.