You'll pardon us all if we don't really believe you, because a)there's no way for any of us to verify this and b)Apple lied about it before, claiming the LED was hard-wired in blah blah same thing, except it turned out it was software controlled by the camera module's firmware.
Source?
The LED being "hard-wired" is a tricky statement to make, and I actually wasn't aware Apple has publicly ever made a statement to that effect. What I can say is that relying on the dedicated LED or "sensor array active" signal some camera sensors provide, while technically hard-wired in the sense there is no firmware driving it, is not foolproof.