What makes you certain of that? I've never read the book, so you can call me out for using the ai slop tools at my disposal, but Grok doesn't indicate where Bessel self-identifies:
Self-identification is not a thing (#844171) -- ignore that. I definitely recall reading him describe anecdotes where his sex emerges: personal accounts or anecdotes
In fact, I spent some four minutes of my life to find examples for you in the text: "my wife", "I grew up, the son of," "little boy." It's literally the first and second page... "he" is all over the praise page, as well as on the jacket description of the author.
You can't miss it. I.e.:
No, Mr. Bunney DID NOT READ THE BOOK, god dammit