I think you should try it anyway. The most common cause for loading screen replacers not to show up is to have the files dated older than the BSA containing the files they need to overwrite. This mod does not include a plugin, does it?
Edit: If that does not fix your problem, make sure the loading screens are actually installed and installed to the right location.
Reset the timestamps, no loading screens. Forgive my ignorance, but I'm pretty sure there's no plugin (.esm or .esp) if that's what that means. I'm not sure how to find out if the loading screens are installed or in the right location because I don't know if they were included in the DarkUI'd DarN 1.6 download in the first place! Can't seem to find a separate download for the loading screens, if that's what I need...
I'll recheck the readme when I have time