Completely untrue. People who are PVS can't swallow their saliva or anything else. That's just false. No, it's true, some can. It depends on the patient. Thus, the ability to swallow can't be used to determine PVS.
Lots of vague and ever-changing opinions on any given medical condition within the medical community isn't there?
Since Terri clearly didn't fit the FL legal definition of PVS your point is moot.