I see what you're getting at, but of course it makes sense that people don't get diagnosed as NT.
NT means Neuro Typical and generally speaking you don't diagnose typical behaviour, because it's typical. Diagnosis comes for things that are not typical behaviour. Essentially diagnosing somebody as NT would be like diagnosing somebody as being healthy, it wouldn't make much sense.

Being that we are not the 'typical' mind set, we're the one's who get diagnosed as being so.

Think of it in another context, for example cars. If you take your car to the garage and they find that it is functioning the way it is supposed to, they wouldn't say "Well we've found the problem, it's working as intended". They would simply say "There's nothing wrong with it".