Talking this seriously, Prince Harry is obviously emotional traumatised by his upbringing. And has written a very emotionally honest book. I believe as part of his therapy journey (and of course a bit of cash).
But i reckon Boris is equally damaged. His childhood sounded pretty fucked up - although in a different way. There is no way that his biography would be in any honest in any way - emotionally or factually. And just totally written for cash and to put his narrative out there.
Also PH's book was written by a star ghost-writer. Boris will do his own in grandiose and verbose tones.