How did it know the print even?
* The reporter lied.
* The reporter forgot.
* Apple devices share fingerprint matching details and another device had her details (this is supposed to be impossible, and I have no reason to believe it isn't).
* The government hacked the computer such that it would unlock this way (probably impossible as well).
* The fingerprint security is much worse than years of evidence suggests.
Mainly it was buried at the very end of the article, and I thought it worth mentioning here in case people missed it.
> Apple devices share fingerprint matching details and another device had her details
I looked into it quite seriously for windows thinkpads, unless Apple do it differently, you cannot share fingerprint, they're in a local chip and never move.
Fingerprint security being poor is also unlikely, because that would only apply if a different finger had been registered.
The fingerprint sensor does not make access control decisions, so the fault would have to be somewhere else (e.g. the software code branch structure that decides what to do with the response from the secure enclave).
I think this is pretty unlikely here but it's within the realm of possibility.