In the introduction to the Chovot Levavot you find he divides wisdom into knowledge of nature, knowledge of how to use nature, and knowledge of Godliness. But within that discussion he says the Arabic names. You can see there he is referring in this last to the subject known in the Muslim world as metaphysics. [He actually says that is what is talking about and then continues that this last subject is necessary to know for the sake of Torah. (So they are not the same thing.) So while he is referring to the actual book of Aristotle of that name he also clearly means the Muslim commentaries on that books which comprised that subject. [I assume he must have meant Al Farabi and Al Kindi.]

The thing about Metaphysics as a subject of study is that it seems to have its ups and downs. In fact I might have gone into philosophy myself if not for the fact that I felt that something was "off" about twentieth century philosophy. But some people did go into it anyway and retained their own common sense Like Dr Kelley Ross of the Kant Friesian School. Dr Ross, Huemer, Robert Hanna and a few others have also noticed this and suggested more or less just skipping twentieth century philosophy. [Dr. Ross wants to start with Leonard Nelson and Fries, Hanna wants to go straight back to Kant and skip everyone in-between, Humer goes back to Prichard and G.E. Moore.]