There's really no such thing as a "classical light source". Rather there could be an explanation of observed behavior derived from classical mechanics. What the

There's really no such thing as a "classical light source". Rather there could be an explanation of observed behavior derived from classical mechanics. What the experiment seeks to do, and claims to have done is to make an observation that can only be explained through non-local quantum entanglement. It's the explanations that are "classical" or "quantum mechanical" not the things in the experiment.