Yep, cause Non-Dualism has the ironic catch that, if your trying to learn it or do it with any degree of intentionality, you are doing it wrong.
But that of course is from the perspective of Non-Duality that it is a 1, even the author would note it would be a 1. Yet, it is a essential text for anyone tackling the nature of cognition, or the Dual/Non Dual divide across world civilizations. The terminology of Dualism usually used here, such as Cartesian Dualism, or of Non-Duality, such as Leibniz's Monism, are weak forms at best of the Indian system, and strongly recommend tackling texts such as this prior to tackling Aristotle or Theophrastus, in the discussions they had of Duality and Non-Duality.
A particular translation stands out as good (internet versions are kinda sucky):
The Heart of Awareness: A Translation of the Ashtavakra Gita
Translation by Thomas Byrom
https://www.amazon.com/Heart-Awareness- ... 1570628971
It is a good read, that translation. It will come off as weird to you, shockingly stupid and short sighted at times, but hey, that's non-duality. Many try it cause they think it is spiritual, as in Religious but not Spiritual, but in actuality it is damn near the ultimate of atheism one can ever get. It was a alternative belief system that eventually knocked Buddhism out of India, most schools of thought in India address and even incorporate in some way the Dualism / Non-Dualism debate.
Plus it isn't a long text, or hard on terminology. Fairly simple to grasp. Fulfills the solution to your worry about Eternal Return of the Nietzscheans variety.