Among the offices attributed to Astaroth is one that stands out from every other in the catalogue: he is said to speak willingly of the fall of the spirits, how they fell and why.
Nothing else in the Goetia asks a spirit for theology. The offices elsewhere are practical, teaching, finding, transporting, procuring. Here the text imagines a conversation about cosmology, conducted with a participant.
The motif has a long ancestry. The narrative of a rebellion in heaven and a fall is not developed in the Hebrew Bible, which does not contain it in the form later Christianity assumed; it is built up in the Second Temple period, principally in 1 Enoch with its account of the Watchers who descend and teach humanity forbidden arts, and it reaches medieval and early modern Europe through that literature and through Christian reworking of it. The Watchers' teaching, metallurgy, cosmetics, sorcery, astrology, is structurally the same idea as a demon who teaches the liberal sciences, and the Goetia is recognisably downstream of it.
There is also an in-text irony. A spirit is offered as an authority on his own damnation, which concedes that the operator does not know the story and the demon does. In a book whose whole frame is Solomon's mastery over bound spirits, that is an unusual admission of dependence.
Whether the compiler saw the tension is unknowable. The entry is short and matter-of-fact, and gives no sign of self-consciousness. But it marks the point at which the catalogue stops being a directory of services and briefly becomes something else: a text with a cosmology it does not otherwise state, glimpsed through one line about a conversation nobody records.