This is a very well done and well executed piece of work, and I really enjoyed reading it and can understand why people nominated it. However it is clearly a work of fiction, so I won’t vote for it at all in the Best Non-Fiction category.
Well, it’s clearly not a work of non-fiction, if you’ll excuse the double negative; I think it’s just as clearly not a work of fiction, either, or at least not entirely. It is a hybrid thing, a mutant, a creature of the liminal; the spotlight is not flattering to such animals, which is why they shy away from it.
The same may be said of its author.