That it does, sticky. However, the point of the pamphlet/warning seems to indicate that regardless of how sound travels by itself, the more dangerous medium for the movement of said sound is the people that hear it and move the words along. Remarks traveling in conversation, sound going across town in cars and subways, amplified by the ‘wrong people’. This means not the sound itself, but what people do with that sound. It’s more a warning to keep your mouth shut for who might hear you in the immediate area than a preposterous allegation of the distance sound can travel unaided.