I think diabetes or prediabetes is a bit like being pregnant, you either are or you aren't.
Truly normal blood sugar will have fasting < 95-100 and post-eating never above 120, and Hba1c of < 5.0. Anything higher than these is abnormal and represents impaired glucose tolerance.
So perhaps you can think of it as mild diabetes. Whether this mild diabetes progresses to more severe diabetes requiring oral meds or even insulin, will depend of lifestyle choices and possible genetics/ environmental factors.
It doesn't really matter what you call it. Once your body starts being unable to effectivelly lower the blood glucose by itself, there's no going back. You can, however, delay the full-blown Type 2 by considerably reducing the amount af carbohydrate intake, and by immediatelly burning the ones that you do eat with excercise or heavy work.