I feel like this phrase is causing confusion and the distinction the author is trying to make is clear in their mind but very unclear to read.
I'm not sure but I think the distinction being made is "not magic" means you're expected to be able to understand how and why something works. And "magical" means it should be surprisingly easy to do what you want.
The problem with magical is that bugs and performance issues will make you feel like you're dealing with a bad spell and there's no logical solution.