Both threat models involve many AIs. In both threat models, there does not seem to be a deliberate AI takeover (e.g. caused by a resource conflict), either unipolar or multipolar. Rather, the danger is, according to this model, that things are ‘breaking’, rather than ‘taking’. The existential event would be accidental, not on purpose.
I also think What Failure Looks Like Part I is more well described as an “intentional” AI takeover than you seem to be implying. And technical work could effectively address this threat model. In particular, there are AIs which are well described as understanding what’s going on. So if humans knew what those AIs knew, then we could likely avoid issues.
What Failure Looks Like Part II is well described as “intentional AI Takeover”. See also here.
I also think What Failure Looks Like Part I is more well described as an “intentional” AI takeover than you seem to be implying. And technical work could effectively address this threat model. In particular, there are AIs which are well described as understanding what’s going on. So if humans knew what those AIs knew, then we could likely avoid issues.