The issue is not whether Mr. Schiavo is lying. Quite possibly, Terri had said that she would rather die than live incapacitated. Many did. I know that I did. It is a natural human reaction, when facing someone severely disabled to say "I'd rather die. If I ever get like that, kill me".
Terri's wish, expressed while she was healthy and young, not put to writing, not listing the specific level of disability that should trigger an assisted suicide, not listing the manner of execution -- is not binding.
Mr. Schiavo may be a misguided creep, or he may be a lying creep. His motivation could come from inability to comprehend Christian ethics, or from, -- just speculating here, -- a fear that Terri speaks one day and shatters the myth of his being a faithful executor of her hypothetical, privately communicated to him, living will.
I see him as a lying creep. JMO.