Maybe a single human, but can you run an entire world civilization and it's environment (basically Earth) in a sped up manner? Because one super fast human-level intelligence is still constrained in a way that all of civilization is not. What is one human sped up a billion times? Is that 1 billion humans? We already have several of those units operating around the clock. And those units have access to the world's resources, whereas one sped-up mind will not, unless it can gain control of the world.
You may not need that much access to the world to learn/infer a lot about it [1] and if a superintelligent AI needed access to more in order to achieve its goal it'd probably be able to get it.
[1] https://www.lesswrong.com/posts/5wMcKNAwB6X4mp9og/that-alien...
To put it into perspective if you can run the human architecture on an AGI at a billion operations per second it's like compressing a historical human civilization of learning into a couple hours.
Maybe for some reason this learning process will be slow or maybe there's some reason why it can't scale up quickly, but based on the learning speed in narrow areas that seems unlikely.
There's also the fact that natural selection which is a relatively brute force sexual selection mechanism still results in general problem solving brains being everywhere - it doesn't seem like something particularly rare.