Nonsense. By all accounts she was in a persistent vegetative state. It would help this discussion if you wouldn't conflate the two.
Karen Ann Quinlan was kept alive on a ventilator for months and that was believed to be the only thing keeping her alive.
She had had irreversible brain damage.
As such I felt this example was useful in answering the question about how long one can exist on ventilator.
Brain death was not defined at the time and the definition that later was first developed in 1981 was in large part due to her case.