I'm afraid it's your review that is clearly ridiculous. The whole thing, to any one with any literary intelligence and sensibility, is transparently a wind-up, a rather feeble and half-hearted literary 'hoax' if you like.
Austen was far too deeply conditioned by the sexual mores and reticence of her times, to have ever written such stuff, even in private. It doesn't even read as authentic for heaven's sake.
This should also be obvious from the fact that, as it says in the author's bio, 'Arielle Eckstut has written over 150 critical essays on Austen (although none, as yet, have been published) ??'
If Eckstut was a serious, bona fide, Austen scholar, do you think all of her many essays would have remained unpublished?
If you don't believe me, just take a look at the various reviews of the book written by newspaper reviewers and academics when the book was published in 2001.
Get yourself an ejucashon.