Exactly, as soon as I saw "pointers can be null or uninitialized" my thought was "this is a really confused soul who wants to teach others."

I made my own compilers for living but I find the text very confusing. I'm glad I didn't have to learn anything from this text. I still believe people should learn C from this book:

http://en.wikipedia.org/wiki/The_C_Programming_Language

It's not so big and it's really good written.