Yes, we know the book presents itself that way. The suggestion is that maybe, in the TrekLit universe, Jake Sisko wrote this as a work of fiction and presented it as an epistolary work in which he interviewed the participants in an alternate history -- just as Bram Stoker wrote Dracula as a collection of journals, interviews, and articles even though it was actually fictional.
It's actually a nice little idea, which reconciles STO with Trek Lit
Nice to see that I'm not the only one coming up with these ideas
(yeah, I'm referring to my STO thread on this board..)