Well, the title of his review says it all:

"Not the book I thought it would be,"

He thought it would be The Making of Star Wars, telling about the scoring, filming, effects, etc., so instead of purchasing the book with that very title he got this and found it focused on the storytelling aspect.

I guess that isn't hit home so hard in the book description, but I thought it was at least indicated. I never was a fan of the description though, as it wasn't written by me. At least this will give me leverage to re-write it if there will be a second edition. :P