Welcome to Ac Christie.
A couple of points that should be mentioned after reading your article and post.
1st one is that the bacteria are not contained in the water primarily, but in the filter media and to some extent the gravel as your article mentions. Therefore large water change will not have a negative effect on the estabilished cyle. Not during the dourse of cycling or thereafter. The only way water changes would hurt at that point is if you did not treat for chlorine or chloramines, in which case the water change isn't the problem, the disinfectants are.
Secondly the reccomendation to use no water conditioner is not a safe one at all. Chlorine and chloramines are put into tap water to Kill bacteria and other living organisms. Adding colonized gravel and not treating with some sort of dechlorinator will kill off at least part and possibly all of your bacteria seed. One could set up a tank with chlorinated water and allow a few days for the chlorine to gas off then add a bacteria seed, but putting seeded gravel in a tank and then adding untreated water would not be a good idea at all. If chloramines are in the water they take much longer to break down and dissapate (That happens to be the point of chloramines) so it would definately be necessary to condition the water with something in the case of chloramines,
Water conditioners such as prime and amquel plus do not remove the ammonia, they bind it into ammonium. It is still available and will be used by your bacteria. So adding them will not in any way hurt the progress of the cycle. Some ammonia tests distingiush between ammonia and ammonium, other do not. So if using a test that ditinguishes between the two compunds, you may not get accurate readings, but the ammonia is still there and available so there is no danger in using dechlorinator that also deal with ammonia. Deoending on your purposes, get a test that shows both ammonia and ammonium as a total then you can still keep track of levels, while not worrying about using prime or Amquel plus.
I would definately say that prime and amquel plus are not needed in a tank with no fish, but they are not detrimental. And no matter what the chlorine or chloramines need to be neutralized so some sort of dechlorinaotr is a must. If you are worried about the test or the ammonia verses ammonium ratio, simply buy the chepaest dechlorinator you can find. Use it during the cyle to ensure chlorine is gone. Simple dechlorinators will neutralise chlorine, and in the case of chloramines, they will break the bond, neutralize the chlrine and leave behind the ammonia.
Dave