Nobody here doubts that one cable can make a difference compared with another cable by getting nearer to the max charging specs of the phone.
But you were saying …
… and this is technically impossible.
Either a phone will have a charging standard built-in or not, no cable is able to bring about improvements using a charging standard which the phone doesn’t have built-in.
You are getting better charging speeds simply by the cable and phone working better together within the specs of the phone. Quality cables tend to help with this, of course, see here for some Fairphone 3 examples … Charging speed problems? Use USB-IF certified cables!