Is it life support in and of itself, or a part of a life support system?
Being on Life Support involves more criteria to qualify as "on life support", no?
All I know is that the State of Florida considers a feeding tube part of life support equipment. As do other states.
And it makes sense. If one cannot swallow like Terri, then one would die without a tube. Hence the part of life support.
Terri has been unable to swallow since she left the hospital and had three yearly swallow tests which she failed.