The researcher says the microphone is not documented in product materials

This is a big red flag. Why would a kvm even nerds microphone? Server room is noisy anyways, what are they listening for? If used in small office where work station is the server, habislah.

Added
Ok I can think of 1 use case for the mic. To listen to motherboard diagnostic beeps. Kinda cleaver actually. It should be documented tho.