Same as the parallel comment: the situation of string theory is the same as with black holes and relativity. It is not it is not testable, it is that it is not testable yet. The situation is very similar of the situations of black holes and relativity at their own time.
The fact that so many people, like you, just INVENT that it is not testable is quite worrying. Why? What's the point of doing that?
The fact that so many people, like you, just INVENT that it is not testable is quite worrying. Why? What's the point of doing that?