@awoelt,
Well, obviously the specific concept of the Matrix used in the series was created by humans, meaning that it would be highly unlikely to actually exist.
Still, on that basis, you could argue that most concepts have been created by humans, at least to our degree of understanding, perhaps even God. Therefore, there is truly no way of knowing. I can't argue that it is a brilliant concept, and I would be fascinated if it were to be true, or even something similar (perhaps not the brains in vats concept).