Formal reasoning is defined, informal reasoning very much isn't.
At the end of the day most people would agree that if something is able to solve a problem without a lookup table / memorisation that it used reasoning to reach the answer. You are really just splitting hairs here.
At the end of the day most people would agree that if something is able to solve a problem without a lookup table / memorisation that it used reasoning to reach the answer. You are really just splitting hairs here.