While not implausible, I don't think that is likely at all. For one, even a very smart person can't know everything or learn too much information. Maybe an artificial intelligence will be just as limited, just as slow as humans, only a little less so. Who says the AI is such a great hacker?
I mean, if it wasn't an AI but a smart person, would you believe that? Is anyone who's smart also rich and powerful even if they have high-speed internet? That reflects the fantasies of Yudkowsky and his geek friends (that intelligence is the most important thing) than anything reasonable. Conversely, are the people with most power in society always the most intelligent?
It is very likely that the AI will be extremely intelligent, yet somewhat autistic, like Yudkowsky's crowd, and just as powerless and socially awkward as they are.