What misunderstanding?
Regarding goal directedness, it’s true that humans don’t perfectly maximize for their goals, this seems mostly due to the cognitive limitations that humans have.
“Mostly” allows for some people to read about corrigibility and think “yeah, I’ll do it”, or whatever you think would be a counterexample to goal directedness of humans.
I don’t think so, this AI would have greater intelligence to understand how to pursue goals (still not prefect) and while it also might have uncertainty it appears instrumentally convergent even with some uncertainty over goals that preventing ones shutdown, gathering power are better strategies.
Superhuman AI capable of takeover may still have (maybe intentional) cognitive limitations/whatever humans have—speed of convergence relative to takeover difficulty is still a free parameter.
I wonder if we can just ignore all prior-dependent reasoning in general and not lose much.