I agree there are currently better ways of doing this (because as you mention the resource/protection trade off for this technology on this application is sub-optimal), but the context here is as an example on HN where the data privacy is obvious so I didn't have to write a whole paper explaining it.
Its "not even wrong", if you had a million monkeys on a million typewriters with a million trillion millenia, still, none would come up with a paper long enough to explain how that'd help anything (ex. trivially, microphone)
