yes. the original diagram I had up would have worked, but you would have had to hold the key in the "start" position AND hit the button.

the new diagram only requires the key to be in the "run" position, using only the "start" button to start the car.

and as far as what he did with the cluster harness:

the relay needs a "ground" and a "positive" charge to throw the internal switch (its an electromagnet).

he has the "ground" side tied to the white wire which is a "ground" until the PCM notices the alternator working, then it no longer has a "ground" (the pcm shuts it off)

so once you remove either the positive Or the negative from the "trigger" part of the relay, the internal switch is turned "off".

In his case, either letting off the button, OR the pcm sensing the alternator is working, will turn off the relay trigger. So even if you held the button down while the car was running, it would not trigger the relay, therefore the starter would not operate.

like I said, its a cool idea, but not "necessary".