Yes, I did read that. I didn't like it, but that won't stop me being a know-all about pianos.
You can in fact get real pianos that have a 'silent' feature. V expensive new, but worth looking out for second hand? You won't get one on Freecycle, but might find one by trawling the internet.
With bad neighbours, it's hard to think of any instrument that wouldn't be found offensive (sadly). How about really annoying them with a trumpet?