Mimicry just means we aren't at true AI yet.

It is coming. The question will be more valid at that point than it is now.

"Will a motorized vehicle ever go as fast as a horse?" At one time, people may have wondered. Pointing out the then current technology of the turn of the last century didn't answer the question. It just pointed to the then current (and insufficient) state of the art. Cars did become faster than horses. In my opinion, it is just a matter of time before AI becomes self-aware.