Ιt is a little complicated...
When the game was released it was unplayable by the loaders due to AP.In a few days,the scene released a patched version which was working flawlessly.At that time,the cheats for the game were working.
Loaders adopted the PoP patch in their new versions,just like NSMBWii,so someone who has an original PoP can play it from USB perfectly.But in this case,the codes do not work....
Hope it helps!