The problem is -- and the author explicitly states this -- this is all total speculation. This
may be wants happening, but it's certainly very _possible_ that Apple is storing something more closely resembling your fingerprint. Or that they aren't discarding extraneous information. Or ANYTHING, really. We just don't know. So while the info box at the top suggests that the author is trying to "Address some of the concerns" with Apple's fingerprint scanning, it does not do that at all. Only Apple can do that. And even then, you have to trust that Apple is telling the truth. And, further, that the NSA hasn't already served them some kind of sealed order that doesn't allow them to disclose the truth.
It's entirely possible the author is correct, too. We just plain don't know.