The truth? I am sorry, but he means his version of the truth. As for the other things he says he wanted the book to be, I got nothing of that out of it. I will restrain myself from reflecting on what I thought of the 'great sense of who I am' part.
When, I would like to know, did Frey and Henley berate Felder's talents and humiliate him? As for the patronising stuff about Frey needing 'therapy' Felder admits in the book that he was out of it on drugs most of the time himself. Who is he to preach?
As for Frey and Henley being 'self-involved'? Hello pot, meet kettle.
Again I say that there obviously has to be some truth in Felder's book but without Frey and Henley's version does he really expect it to be taken as complete gospel?