Guys this is the moneyshot right from that article. It clearly states the rotor will move in relation to the terminal. It wont be any more clear than this. The idea is to get the phsecjust right so it will still work with the advance and not jump. That is the rest of the article.

You can have an adjustable rotor or a different reluctor to move the phasing to where it needs to be. Clocking might be another term that explains better for some.


How it Works
With most typical mechanical advance distributors, the weights and springs are located on a plate that also mounts the rotor. As rpm increases, centrifugal force pulls the weights against spring tension and moves the plate, which advances the rotor in relation to the spark plug wire terminals in the distributor cap. The plate that mounts the rotor is connected to the distributor shaft that also spins what is sometimes called a paddle wheel, or reluctor, with 8 lugs on it (for a V8 engine). When each lug passes by the magnetic pickup, it generates a signal that triggers the module to initiate a spark from the coil through the rotor, across the gap to the distributor cap post and on its way to the spark plug. . In a standard non-EFI application, the reluctor tabs pass the pickup at exactly the same time that the tip of the rotor lines up with the intended terminal inside the distributor cap. These two are in a fixed relationship with each other. Mechanical advance moves not only the position of the reluctor in relation to the pickup but also the rotor in relation to the distributor cap spark plug wire terminal.
Vacuum advance works in a similar fashion. When engine vacuum is applied to the canister, it pulls on the plate that mounts the pickup. By moving the plate in the opposite direction of the rotating shaft, this also advances the timing.
All of this motion affects the position of the rotor in relation to the spark plug wire terminal on the inside of the distributor cap at the moment that the signal is sent to the CD ignition box to “fire” the coil. Stock distributors align the rotor with the spark plug terminal on the distributor cap with the engine at the initial timing position, and since the reluctor and rotor are fixed together, mechanical advance does not cause phasing issues because as the trigger is advanced, so is the rotor. But performance engines with EFI or power adders that require retarded ignition timing combined with high output spark demands place undue load on the ignition system and place a premium on rotor phasing. Let’s take a look at a typical situation.