The bomb is a bit like a jet motor
Very simple when you look at a drawing or read an explanation of how it works, but in practice it is a lot more complicated than that.
In addition getting the materials to build a bomb is not quite the DIY thing.
But then again as you said the Basic theory. What was publish amounts to the same as saying, an airplane has 2 wings a motor and a pilot sits in the middle.
I am not saying it correct but!

