Personally I take creatine for entirely non-cognitive reasons, so it's reassuring to know it's probably not making me any dumber.
it might even be counteracting the negative effects of your frequent contact with airborne nitrogen
You do realise that you cannot prove a negative? So the right conclusion even informally cannot be “ probably not making me any dumber”.
Though you also have to consider potentially adulterated powder (accidental or not) in the unregulated supplement industry.
That's why I dropped creatine since I didn't notice any benefits when I tried it for a year.