It absolutely is true. I have a PHD in early XXI century north American showering practices and I know for a fact that 65% of showers in the North East and 66% of showers in the rest of the US look like this, thus, making it a typical American shower. I will admit that there is a debate within my field of research as to how how public and hotel showers should be counted but most experts agree with my position that what should be taken into consideration are the shower units, not the number of uses they get per year.