Obviously, Wolf is also refering to others parts of Davening. He was using Shmone Esrei as a booster for quiet Teffilla.
A person should bear in mind his surroundings. If people finished a piece and are waiting to hear the Baal Teffilla, you have to tone down. I think it is inconsiderate to Daven loudly very close to someone when you are a whole different part. However, don’t write off Davening loud, just be considerate.