Yes, already checked, you can upload and test in iOS devices using Cocoon JS but when the time comes to the final publishing, what they send you as i say is a XCode project ready to compile for App Store. You need a mac to open XCode projects. As it's the final step, maybe you can just ask a friend with a mac just to open the project and publish the game, but the thing is that a mac is needed to finish the process.
Adobe PhoneGap, for example, seems more simple to make all the stuff, but people say that the games run slow when published with it.