Maybe I'm misunderstanding him but I think he says the music track can have hard panning, and it's the headphone playback system that should do some compensatory processing so that it sounds as if it was played on two speakers in a room.
Don't ask me how it works but I know gaming headsets try to emulate a surround setup.
Yes, these sorts of compensation features have become common on higher end headphones.
One example:
> The crossfeed feature is great for classic tracks with hard-panned mixes. It takes instruments concentrated on one channel and balances them out, creating a much more natural listening experience — like hearing the track on a full stereo system.
Don't ask me how it works but I know gaming headsets try to emulate a surround setup.