No, you are making an inference that does not follow. She is entitled to refuse medical treatment. She is not entitled to commit suicide, even under Florida law. It is also not credible to believe that she would choose to starve herself to death.
It may not be credible to you. But people refuse them, consciously and willingly, all the time.
You position has boiled down to either (1) Terri can't refuse a feeding tube or (2) I can't believe she would refuse a feeding tube. Neither of those comports with applicable law.
Thoughtomator, you are drawing a distinction here I'm having trouble following. Are you saying people are entitled to refuse medical treatment only so far as it will not lead to their death? Many people consider chronic feeding tubes extraordinary means and say so on their living wills.