None of those fellows are responding to the authors self admission. Weird.
I didn't respond because I thought you were joking. Do you really not get what he said? I will paraphrase for you. Here is what he said
“Many of the accounts of what has happened in the Trump White House are in conflict with one another; many, in Trumpian fashion, are boldly untrue. These conflicts, and that looseness with the truth, if not with reality itself, are an elemental thread of the book.”
Here is the paraphrase
"Of course some things in the book aren't true. Trump and his team are a bunch of liars and say things that are obviously not true. However I felt I would report things as they were said and let the chips fall where they may"
In other words, when you are quoting liars for a book, there will be lies in the book. I thought it was pretty clear..