Free will is not what most people think it is.
We have no direct control of our thoughts, feelings or actions despite our desire to believe we do.
I haven't read the book but I'm sure I'd probably agree with most of his arguments. I'd probably contest his framing.
Free will is related purely to the agreements we make. The sky is blue, the earth is round, bad people go to hell, authority is unquestionable, etc. Free will is the ability to create definitions & ultimately beliefs. Most don't exercise their free will, they don't question their beliefs. They just take it all as fact & assume that they can't change the nature of their reality. Most people don't break their conditioning from childhood. They don't explore the beliefs that are in their subconscious.
Our thoughts, feelings & actions arise as result of our beliefs & definitions. You can't even experience an emotion or thought without first having a belief. Everything you do, every action you take, is because you believe it's in your best interest.
Not everything you do is in your best interest.