I think the same use case is covered by a radio or speaker that simply plays 24/7 in there. This doesn't need to be a smart device, no motion detection is needed.
IIRC, The Angelic (pub in Islington, London) used to play comedy shows from BBC Radio 4 on a loop. Makes customers smile, covers up noises - everybody's happy.
I agree, this product is unnecessarily overengineered
Or just wire a sound generator into the lighting circuit.