I see two possibilities here: this guy is a complete and utter idiot, or, this woman is lying...
My reading is that Schiavo is hot-tempered, vindictive and not very bright. (I don't think he had the guile or smarts to dream up this legalized murder scheme.) Felos is intelligent, cunning, focused on his "right-to-die" crusade, and mad as a hatter.
I hadn't heard of this nurse or read this affadavit before, but she's plainly a careful, trained observer and her words have the ring of truth.
But to be caught lying in a sworn testimony? What could be a motive for her to do that? I can see suspecting that someone is lying --- but you'd still have to look for their motive to lie. I can't see one.
And she did swaer an oath. He could sue for DEFAMATION!