That's little more than an ancedote, not anything that proves or disproves a thing. There are a lot of factors involved here. The sound of the running water (if any) banging or clashing of pans, dishes, etc.
The shape of the rooms, the paths the sound had to travel etc.
Anyone who has tried to listen to a game on a TV or a Radio in another room while doing dishes can point out that it is sometimes not possible to hear something you're deliberately trying to hear, even with a fairly loud volume setting.
Nice story, but does not prove or disprove anything.
:devil: