When the sign or website is exclusively in Chinese, or mostly in Chinese, especially in Richmond Hill and Chinatown(s), then usually you'll find most if not all of the customers will also be Asian.
All of the Asian places discussed in this thread, and pretty much all of the massage places discussed on this board generally, are "mainstream" rub and tugs of varying quality and mileage (typically low) with Asian attendants and, mostly, non-Asian customers.