I read the book too.
In times of failure, ego is the enemy.
In times of success, ego is the enemy.
In times in between, ego is the enemy.
There are many golden nuggets inside.
You need to play the long game though.
Why do you say it is the fastest way to career success?
I would say its the fastest because it opens up room for more opportunities to come to your life.
Growing a blog for example requires you to help solve other people's pain points through writing. When you guest post or ask to be promoted, you can get there much quicker if you help them get to their goals quicker too.