Deceiving a single human is pretty easy, but decieving the human super-organism is going to be hard.
Also, I don't believe in a singularity event where AI improves itself to godlike power. What's more likely is that the intelligence will plateau--I mean no software I have ever written effortlessly scaled from n=10 to n=10.000, and also humans understand how to improve themselves but they can't go beyond a certain threshold.