I don't know of that book, personally, maybe someone here does and can comment.
However, horses are still horses, so I'm sure there is something useful to be gained by reading it. If you read something you are unsure about, just ask. We're here to help, and I'd be interested in learning more what they are sharing. So feel free!
Just like with everything, it never hurts to read and learn more, but sometimes you just have to question what seems "not quite right". Many things have been learned over the years, so you take what is good, and leave what isn't or doesn't make sense. And question things if you're unsure.
You'll do fine, and we're here if you need an opinion or someone experiences with something you read that you are questioning.
Good job for learning more!