Well, think about it. Isn't having a feeding tube surgically implanted into a person's stomach, "artificial"? Has this ever been done anywhere in human history prior to the late 20th century in the West?
Obviously, it's artificial.
Lastly, should the US military in Guantanamo Bay immobilize the hunger strikers and insert a feeding tube in them to keep them alive? After all, it's only "natural" life support.
I agree. The argument that people use equating the feeding tube to feeding an infant isn't equivalent.
If you put formula or food in a baby's mouth, the baby will swallow. Terri Schiavo had swallowing tests done showing she could not swallow, so the food had to be conveyed artifically. An analogy would be while air isn't artifical life support, a ventilator to convey that air to the lungs is. Ditto an IV to convey water to the veins.