This was one of my favorite books growing up, but the linked article is iffy at best. Author doesn't understand the difference between quantum mechanics and general relativity, which should be a nonstarter on HN. Would love to have a better article as a starting point for discussion of this book here.
I think there is a scene in Wrinkle where Meg uses the fact that atoms are mostly empty space to pass through a solid wall. However, this is really more of a classical view of atomic structure (atoms as hollow balls), rather than QM.
I feel the same way you do about how the article explained the concepts. I found what seems like a fuller explanation of a conceptualization of Kairos here [1] - even if it may not be the most transparent:
I loved A Wrinkle in Time and my other favorite was A Wizard of Earthsea, which I remember randomly finding in a dusty attic in a summer school when I was 11 years old. Talk about magic.
It was on a top 100 list a few years back that I started working my way through. I really disliked the book having not read or even heard of it as a kid. It seems that it is generally well liked, so I'm not sure what didn't connect with me.
This book had such a profound influence on my life and young mind. It basically formed a lot of the values I have and ideas about what is right and what is wrong.