Which side has expressed more interest in letting real evidence of Terri's real present situation reach disinterested persons?
If Michael wanted to show the world that Terri was PVS (assuming she actually is, which I doubt) he could let the parents take a blood sample and video her, with Michael running a silultaneous video. The parents could then confirm that Terri was not sedated, and would have video that would either support their case or not. If the parents tried to take video clips out of context, Michael could pulicly show them in context.
There are many other things Michael could do if he wanted to show Terri was PVS, if she actually is. His refusal to do any of them suggests pretty strongly to me that he believes people might decide she's not PVS and that he's a liar.
Congress isn't going to accept Judge Greer's decision at this point, even though they may ultimately have to.