At the risk of sounding stupid. Doesn’t this mean it would mask actual kidney disease? So you’d be ignoring potential warning signs.

IF you tell your doc, they can adjust their interpretation of the test.

Edit: see comment below (i.e. better to stop taking creatine at least a week before a test).

There is a much more accurate test called Cystatin C that can be used instead, and it isn't subject to being thrown off by creatine, muscle mass, etc.