True, but it's always best if you let the water sit and not do any water changes during a cycle.
That is only true for a fishless cycle, this person is wanting to do a fishy cycle, in which case it is imperative that you keep the ammonia and nitrites below .25
You never know what you're introducing into the water during a water change... If chlorine or something gets into the tank it will kill your tiny bacteria colony, and you're starting all over. Just one less thing that could possibly go wrong.
Thats why you use something to remove toxic chemicals like Aqua safe.