My source is "none of us have ever seen a robot that can navigate unfamiliar 3D spaces as well as a cockroach." If transformers were capable of the job we would have seen a smart robot by now. But all of our robots are truly mindless compared to the simplest insects.

I will change my mind if someone demonstrates such a robot. Absent this demonstration, cockroach-level AI is still an unsolved problem. Given how ignorant and arrogant and wealthy AI researchers are, it will remain unsolved. I don't think anyone alive today will live to see a robot smarter than an ant.