I guess you are correct and the whole book is about selling his soul.
Sadly, Harry may think he was in control but these writers/etc always want their money's worth.
I've actually seen soaps/films where a reporter takes a long interview and just quotes a few words to make the outcome look entirely different
In Harrys defence, IMO Harry was talking at length about his time in Afghanistan
and made a passing comment to number Harry may have felt responsible for killing from his helicopter gunship and we end up with headlines like this.
Whatever it was, the whole book is unnecessary IMO and I feel Harry will one day regret it.
There was no reason to talk about the above as the royal family are always targets of nutters and these few words do not help.