When my blood sugars and A1C were high, I decided to do keto because it made sense to me to lower my glucose levels and it worked - my A1C went from 8.9 (probably artificially high because I was taking Prednisone because of a nasty bout of COVID) to 6.2 in three months through diet alone.

You didn't 'fix' your diabetes, if that is what you are implying. You body still cannot handle carbohydrates. You simply stopped consuming them.

An analogy is having pain from a tooth cavity. If you stopped chewing on that side and the consequent pain subsided, you didn't solve the problem. You simply stopped agitating it. The problem is still there.

Similarly, diabetes is the inability to metabolize carbohydrates. There are a myriad of reasons why. Learning to consume carbohydrates and the various tools provided by the ADA is still necessary.