When people talk about Orientalism, they usually read Edward Said and say "Gramsci and Foucault, simple enough." Grosrichard went considerably further.
His insight was to focus on the libidinal kernel of European fantasies of the East, producing a psychoanalysis of the so-called Asiatic mode of production. Europeans love the idea of being an absolute ruler served by docile minions. These fantasies have real effects: they are not delusions, they are illusions. I will quote at length from the conclusion:
"This is an awesome masquerade, for which the eunuch is the stage director (the one who allocates the parts) as well as the leading actor (once in costume, is he not able to play all the parts, from the wretched slave to the ingenu seducer?). But this living incarnation of otherness, without whom neither the One nor the others would exist, this caster of human lots, this guarantor of hierarchies, this educator of the sexual relation, this tireless go-between, can set up his new harmony only by immediately bringing about, as a consequence, the conditions for its failure."
In less jargon-filled English: the unlimited enjoyment of the seraglio construction are designed precisely to mask the castration of the European subject. Politics is conditioned by fantasy; to be truly radical, we must be unafraid of confronting its root in real encounters between bodies.
This work is often compared to Saïd's Orientalism, as a Lacanian alternative to the Foucauldian approach taken there, but while there is some overlap in the topics discussed, its emphasis is much different: Grosrichard is interested in despotism as a political category, and turns to Montesquieu's Persian Letters to elucidate how European notions of political despotism rely on its specifically "Asian" character, the despot as a figure with an accumulative drive for jouissance, with the seraglio as the phantasized site of this accumulation.
The pages reek of old white academic male who "knows" stuff. In 1942 this would have been a very moderate text, but in the 2000s the implied racism and entitled assumptions are just unpleasant.