No, people are being silly. Often people are kept away from their 'home turf' in an effort to make sure that when they absorb the brief (which they're usually given by political and civil advisors) it is in a way which is appropriate to the level they're working at. They're executives, not (eg) healthcare workers or train drivers etc. Their job is not to have a technical grasp of how to perform operations or drive trains, their job is to understand how to measure and influence the system they inherit.
In principle, this might not actually require that much pre-existing domain knowledge.
In principle, this might not actually require that much pre-existing domain knowledge.