Gee, I remember the Mike Wheeler site had a couple of Psychological surveys on Brian based on the book-- I remember thinking how absurd that was! But then, the authors of those essays had the right to think that it was Brian (who got paid for the book, BTW) who was telling the story.
No, they didn't - from the very moment the book was published, everyone with a basic grasp of BB history and other BB writers realised that it was a pack of lies combined with the wholesale plagiarism of earlier authors. No serious fan has ever had anything but disdain for that book.