kenbong, i think you are a little confused about what rbk is saying.
the internet quote is essentially the same as what he suggested.
1. find focus
2. lock focus
3. reframe to put focus point in the composition you want.
except that rbk suggest find focus by focusing on the subject directly but the net suggest that you can find the focus by aiming at another object in the same vertical (coronal) plane as the subject. you do that when the original subject is too dark, not well defined or have poor contrasting tones, like what rbk say.
put it simply, you aim the centre of the viewfinder where the red box is, at a person's eyes, for example 2m away, zoom in your focal length till you get the appropriate size, e.g. from the forehead to the shoulders in a horizontal "landscape" orientation. now while aiming the centre of the viewfinder at the person face, ie the person's face is in the centre of the frame, you half press and lock the focus to be at 2m away.
now you hold on to the half press, and reframe wherever you like, the focus will be sharpest at anything that is 2m away or near to it. if you want, you can now recompose/reframe, so that the face, instead of being in the centre of the frame when you lock focus that time, can now be shift to one side, maybe on the left of the frame, while a garden with the tower in the background is not on the right of the frame.
1. find focus (subject at centre, focal length decided)
2. lock focus (half press)
3. reframe to put focus point in the composition you want. (recompose, subject elsewhere in the frame)
4. shoot
alternatively, you can also do the following instead, frame to your desired composition, ie. person on the right, garden on the left, zoom to suitable size at respective focal length. use the navigator button to shift your viewfinder focus point/area from the centre to that subject, ie, the person's face. lock focus and then fully press, in one go. in summary, this means
1. frame (subject in final position, focal length set)
2. find focus (use navigator button)
3. lock focus (half press) to allow auto focus to achieve focus
4. shoot
i prefer the first method as my nikon D50 only have 5 points, and it is also easier and faster to reframe manually rather than to use multiple press of the navigator that isn't very accessible.