I would posit the device is not intended to produce hearing loss. I would think the living spaces have been invaded by a carrier wave that retrieves sounds and the hearing destruction is collateral damage. The Cubans are in fact, listening
Russian capability was attempted by the Cubans but failed in execution
It’s possible.
There’s also the possibility this might be our spies accidentally hurting our own. White noise generators can cause issues with poor settings and long term exposure. Some wavelengths folks don’t notice but the energy from the sound can effect hearing.