I think this was something designed to make people laugh at the idea he would be accused because he was so nervous.
The made call he made with this book was thinking people would take some of it with a pinch of salt rather than dissect every sentence and use it against him. Despite the fact his major complaint is that is exactly what the media have deon since he was born.
I don't think you can have loads of trailers of them sitting there, all serious, declaring that they're about to reveal "their truth" and then expect everyone to take it all with a pinch of salt or see it as all a bit of a laugh and he didn't really mean it.
Whatever the truth of this anecdote is, none of it is a good look. It's either an exaggerated "I'm mad, me - what a lad I am" story, which is a bit pathetic in an adult man. Or it's all true. Not sure which is worse, and why H felt the need to share it all with the group.