He studied the revalation book in the 90s since then

Many of the explanations covered in the book have changed, but he still claims that this book convinced him that the organization is the truth and must have divine backing. I understand why he felt that way when he first studied it, but not now; after so many changes, can he truly claim that based on this book he's still convinced this is the truth?

As Witnesses, we ignore so many clear indications that this religion is false.