If the weather isn't too harsh and there's enough water and fruit or plants around then it's actually less hard to survive than you might think (the tricky bit is knowing what is edible, but you've got about 2 weeks to experiment).
In the right conditions it's easier to survive than many assume. To be honest with statements like "their survival is a sign of a knowledge and relationship with the natural environment of life, which is learned from the mother’s womb and practiced from a very early age" I think there's a lot of "native fetishism" and woo-woo thinking going on here. In this case the kids apparently also ate food drops, and were malnourished when found.
I don't want to come of as too cynical or dismissive, because of course it's an amazing story! The real miracle is that they survived the plane crash at all, and the survival is more "amazing story" than "amazing miracle".