I don't see how that is the same thing. If the child can only be kept alive by ventilation, with NO HOPE of being weaned from it, then he IS being kept alive by artificial means. In reality there are cases where people are kept alive only by machines when there is NO HOPE of survival.
Terri is not one of those cases, as has been proven over and over.
The problem is your use of artificial means. I am diabetic, I must take medicine or I will die. Is that artificial? I have no hope of being weaned of it.
Another problem is your use of survival. If there is no hope of survival, how do the machines keep them alive. I always understood survive to mean "continue to live". Do you have a new definition?