Is the Quantum Eraser Really a Double-Set Experiment?

In the quantum eraser video, you don't have to do anything to the past. What you basically do when you tag those photons by the state that they came through,. You're creating groups of photons, which you can later use to sample them into sets. So if you combine them, then you get what you actually observe in the double-set experimentif you know which slit the photon went through.