I definitely think you have a point about the target audience. This looks to be a great resource for someone wanting to get into django who has experience in other web frameworks.
I would recommend the site qualify what they mean with the term "beginner".
By "beginner" we mean, someone with knowledge of Python, and who has started to play around with Django (i.e. started to undertake the official django tutorials).
We started the book to help my 3rd year undergraduate computer science students, who learn python in 1st year.
I would recommend the site qualify what they mean with the term "beginner".