Tweet thread seemed to imply Xcode 3.1.4 was being used. I think you needed Xcode 3.2 to target the first gen iPad (which is Snow Leopard or higher as you mentioned). While UTM wouldn’t probably work on it, I did get Bochs running on the first gen iPad and booted Windows 95 (albeit it took 45min to start and the iPad felt like a hot plate), so I wouldn’t say impossible, just very very unlikely.