There's also another small hint to this - Taffe is Brutally Honest, and that is an actual trait of deaf people.
When Muneca told her platoon and Kathy Lee about Hermes, Cinna guessed that his codename might be Mercury. Mercury is the Roman name for the Greek Hermes. Keep in mind that Cinna is from Italy (home to the Roman Empire); she would’ve grown up hearing about the mythologies with the Roman names, as opposed to the Greek versions that the others likely would’ve heard.
Observe Muneca's wince when Qamra reveals her eyepatch to the others. Why did she do this? Because Qamra lost her eye and ear to a fire attack.Muneca knows all too well what it feels like, since she was burned in a fire as a small girl, and has extensive burn scars which still hurts to this day.