Not nearly all prompt injections are by any means that absolute unless starting from the exact same state. Many of them will also work only probabilistically unless you turn temperature to 0 for exactly that reason.

And at the same time, whole books have been written about how reliably we can induce certain behaviours from humans.

E.g. the Blue-seven phenomenon [1] - I've personally experienced that second hand and it was how I learned about it by searching for it subsequently because I suspected it was a known thing, having read about cold reading before. A co-worker came back from lunch and recited a story about a cold reader that had run a routine on him exploiting the blue-seven phenomenon, and I knew before the story finished that the answer would be "blue" and "seven".

See also Cialdini's book "Influence" which is full of examples of just how predictable peoples reactions are to a whole lot of things.

That there isn't a perfect overlap does not mean there aren't plenty of similar "hacks" that causes us to respond in very predictable ways.

[1] https://en.wikipedia.org/wiki/Blue%E2%80%93seven_phenomenon

Anyone is free to draw whatever analogies they want, but they either make sense or they don't. Outside of philosophical discussions or science fiction, comparing influencing humans to prompt injection is silly.