It might be helpful if you would state precisely which part of this you think is bunk and why.
I assume you are referring to chapter 6, but it is a fairly long chapter, and covers quite a bit of ground.
Actually I don’t see a lot to disagree with: it covers the basics of why nutrition is important in physical training, questions of scope of practice and the roles of trainer and nutritionist, the importance of fact based evidence over celebrity hype, and some very basic science on energy balance and how food is burned and energy used. Some of the things on glycemic index I have heard at recent conventions.
But I could be missing something, so if you could be specific on what you disagree with it would help in stimulating a discussion in this forum.