More than that: does Michael's refusal to allow testing or video recording of Terri in a provably-unsedated condition make more sense if he believes she's PVS, or if he believes she's not really PVS?
IMHO, Michael knows full well that Terri isn't PVS, which is why he restricts access to her by almost anyone whose claims of interaction he can't dismiss as "wishful thinking".
Nurse's reports from before Michael's efforts at starving Terri indicated that she had some ability to speak. If her condition has gone downhill since then, it is almost certainly because of Michael's neglect. Since her condition in 1993 would not justify her execution, if Michael deliberately sandbagged her condition so as to justify it, that would make him clearly and unambiguously responsible for her death. Too bad FR won't let me say what I really think about that [bleep]-[bleep] [bleep]-[bleeping] [bleep]-[bleeping] [bleep]-of-a-[bleep] [bleeper][bleeper].
The ba$tard is just plain mean. It doesn't matter whether Terri will ever get better. He could cut his ties and just let others care for her. This ain't traditional life support here, it's just plain feeding.