He may have been referring to this without knowing it. He may have meant to say final approach segment. Think in terms of visibility and when you can continue the approach. At ORD, they will sometimes put you on a 20 mile final and the visibility could be rapidly changing. Lets say you are on that 20 mile final and the vis goes to zero. Can you continue the approach? Yes you can if you are on that approach final segment.

As far as the FAF, I think the previous guy is correct when he said its the intersection of the final approach course and the FAF altitude...depicted by that little lightning bolt.

I hope I'm not spreading incorrect info...someone correct me if I'm wrong. I've been out of the 121 world for about a month already!