I mean, obviously Weyer is full of shit. His soruce tradition must be the same as that of the French, but he cuts a whole chunk from the beginning, which is why the Ars Goetia mentions Amayomon and Lucifer, but provides no information on them The missing hierarchy of the Goetia actually look like this:
At the top, 3 spirits:
Lucifer
Belzebuth
Sathan
Following them, the 4 kings of the 4 directions:
Orient
Paimon
Amaymon
Egyn
Only the description of Egyn aka Equi is missing from the French, although the French has fewer spirits than the Pseudomonarchia, so it is itself derivative of a larger corpus.