I haven't - although I think having read the intro that I've seen it quoted without attribution. I will read it!
Its reminiscent of a lecture I watched about the British Empire in India (I forget the name, but can probably find it again if you're interested), where the lecturer drew a parallel between the colonial concept of 'empty land' (like in Australia, ignoring the people who were living there, or indeed the US), and a similar concept used to justify conquest of obviously more populous and urbanised places like India, one example being with this kind of accusation about women - that the people there were 'savages and weren't treating their women properly' (betraying of course the accuser's view of women, as property without agency), and that a 'white coloniser' would have a better idea about how to 'treat women' (property, like land) than the native inhabitants. I suppose related to the liberal and religious concept of the civilising 'burden' of the coloniser. But we have seen this used very recently, with Afghanistan.
In any case, thanks for the link!
I took it to mean manichean type doctrine, but I might be wrong. For example, Augustine (possibly the preminent early theologian of Christianity) was originally a Manichean - it was very widespread and popular, influencing thought and understanding to this day, being a sythesis of 'western' and 'eastern' (and no doubt 'northern', i.e. turkic/siberian too) thought of various kinds.