Yes from what I gathered from her even an AOC who have a jet fitted out for medical work have to shift that duty of care to a medical unit (ie Doctor or Hospital)
thats how it is mostly done. but now we can start to question who is in fact the company which actually carries out an airborne ambulance mission .
the medical unit chartering the plane or the airline company chartering a medical unit ?
just hiring a doctor for a flight may be not enough, even when he posseses the needed equipment since being an approved medical doctor as a physical person does not mean he/she is an authorized medical unit when i understand it right.