quantification of light as a particle and the theory of its wave particle duality yes is by definition quantum mechanics, which was proven first by the double slit expierament. Up until then 2 light sources never canceled each other out so it was assumed light is 100% quantifiable and a particle.
(quantify is actually where the word quantum comes from)
noise canceling headphones you’re good for tho, the existence of waves is a different subject
Edit: and IG if we want to talk about fundamentally untrue then, your comments also wrong cause its a pretty big thing in science that light ISNT just a wave… but of course I’m not being nitpicky right?