It seemed like a weird way to convey the content, but I found myself getting into it after a few slides, in a Zen sort of way :)
The author is Japanese, after all.
Of course, I've been a constant Emacs user since about 1990, so maybe I'm cutting him some extra slack. I love Emacs. It is so powerful and I feel that even after 23 years of daily use I'm still only touching the surface of what it can do.
In some ways Emacs has fallen behind the state-of-the-art, but the community is so vast and talented that they keep coming up with awesome add-ins to keep it competitive (thanks, guys!).