Absolutely no one is suggesting that audio is being used to spontaneously infect previously uninfected systems. No one has ever suggested that except for people

Absolutely no one is suggesting that audio is being used to spontaneously infect previously uninfected systems. No one has ever suggested that except for people who have failed to carefully and completely read the article. The claim is infected machines are using it to communicate, not that uninfected machines are being infected by it.