Existing high-strength alloys like MP35N are already extraordinarily difficult to machine. The "super alloy" in the story is said to have a compressive yield strength of 2 gigapascals, which is about MP35N tensile yield. Sounds like this "super alloy" isn't that much stronger than existing high strength alloys. It does have some fairly exotic alloying elements, tantalum, niobium and hafnium that probably don't come cheap. This super alloy will be used only in a very few applications.