What's inaccurate about it? The point is relative to the frame, not relative to the subject.
So if it shows somewhere within the frame then it is correct even though it wasn't the one that I originally chose? If I focus somewhere in the bottom left of the frame, with the center focus point selected, and focus lock and then point the camera in a slightly different direction and my focus point is in the center of the image when I press the shutter then you don't know where the original point was. You only see in the program where the the focus was after you pressed the shutter not the original chosen one.