Well, I've never heard anywhere that Apple was sharing the fingerprints with the NSA. As far as I know, nobody said that... It's just the obvious* default assumption.

And the matter of default assumptions is that you need evidence that they are false. Apple denying it is no evidence. But yeah, the point about the microphone and camera stands.

* And it is obvious, no point is arguing against that. When everybody makes the same assumptin the first time they have a new piece of data, the assumption is obvious.