We're getting way off topic here... but no, I didn't think it was a dig. I think he was making an assumption based on your comments concerning your FA. To me it sounded like you depend too much on the FA. It never hurts to be educated on subjects in order to make wise decisions along with advice from others. I saw nothing wrong with the suggestion to check out the book. I believe he was trying to give some basis for his opinion, weather the book is correct or not and invited you to check it out.

Happy motoring.