I just read the book. It is interesting and covers the basics of food gardening from a theoretical standpoint. It doesn't have a person as author and the writing shows clearly that it is more a set of articles to introduce the subject than in depth information. It seems to be written by a ghost writer, not someone with practical knowledge.
I don't personally agree with part of what it says, like the treatment of weeds (most of the named are edible and highly nutritious). I do agree with others, like the mention of dandelion for salads. Some of the information, like what to plant close to what, is something to ponder.
The last page of the ebook shows a couple of links to other products being sold, hopefully they do contain practical information.
I gave it three stars because the writer did a good job, even when he/she might have never planted anything in his/her life. To the publisher.... they could have given more information. With so little practical info they are surely losing sales of the books promoted.