Exactly. Creatine has ZERO effect on THC metabolites. Creatine supps are taken to during waterloading to help maintain satisfactory creatinine readings.
Creatine metabolizes into creatinine, taking 2-3 days to do so.

THC is stored in fat cells. When fat cells burn, THC is metabolized into THCA and released back into the bloodstream, making an eventual exit via the urine. There is no such thing as a product that can prevent THC from being metabolized and released back into the bloodstream. The only thing a person can do is stop all exercising 3 days before the U/A, and be as lazy as possible to prevent fat from burning, thus releasing a bunch of THCA into the bloodstream, which end up in the urine to be detected.