Firstly the game of poker is as much about reading your opposition and hiding your emotions as it is about understanding your cards. But secondly the discipline of writing a book about your cards is somewhat less impressive when you realise that every hand is recorded on video in great detail.
I don't disagree with the sentiment of the post and I also don't disagree that there is plenty to learn from a book. I stand by the rule that a good poker player is something innate and brought to the surface with practice and not something that can be taught or learned.
I run an IT company within a digital marketing group ... even we are locked down! It is unbelievably annoying so we (being knowledgeable IT people) punched holes through the security and it's no longer an issue. But everyone else in the company is jealous of us.