I have actually known Jack Chapman for several years, as he is a colleague of mine. I cannot endorse his product as I have not reviewed it. I have his book, "How to make $1,000 a Minute," and it strictly deals with how to avoid the salary issue until the last minute. I have also heard him speak and he does know his stuff.
In my opinion, if Jack says you will get your money back - you will. He has a great deal of integrity.
However, the things that are listed in this package seem to be more common sense things, not something that would truly "replace" an actual interview coach. There are several books out there on behavioral interviewing that you can buy. But once you go through interview coaching with someone, you will see that no book can replace the feedback you will receive from YOUR answers.
Now, understand, I am NOT saying you need interview coaching. Even if you practice with a spouse, friend or perhaps someone you know that conducts interviewing, you are going to be better off than reading a book.
JMHO