Occam's razor says they are not going to keep a list of all devices and their configurations including types of ear pieces and their sound pressure level output

Occam's razor says they are not going to keep a list of all devices and their configurations including types of ear pieces and their sound pressure level output at each volume setting when they could just say if (volume > .75){ warning();} and call it a day. There is no benefit to going above and beyond in this case -- they just need to say they warned people.