having re-read the guide, a footnote to the zoom/shutter speed section - you also need to factor in the crop factor.
For example, a 200mm on a full frame sensor will, as a rule of thumb, require at least 1/200 for a sharp picture.
However, on something like a Canon Rebel/350D, with a crop factor of x1.6, that 200mm becomes a virtual 320mm lens, thus needing a shutter speed of 1/320 for the same effect.
I would probably go further and say use x2 as a guide e.g. 1/400 if you want clear sharp pictures.
Naturally this is modified by the skill of the photographer, tripod use, image stabilisation, and most importantly, available light
...and as the guide says, you ignore it all if you want movement of any sort in your photo!