Price and Wharton's retrocausal models show λ-independence can fail via backward causation while signal locality is preserved, since no controllable intervention exploits the correlation.

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Controllable intervention(as used in causation theory): An action you deliberately perform (like an experiment) where you have conscious control over what happens, as opposed to just observing something that occurs naturally.
Price and Wharton(as referenced authors in physics and philosophy): Philosophers who have worked on theories about causation and time; they're known for exploring models where causes might work backward in time.
Retrocausal models(as used in philosophy of time and physics): Theoretical frameworks that allow effects to happen backwards in time—meaning the future could influence the past, rather than only the past causing the future.
Signal locality(as a constraint in physics): The principle that no information can travel faster than light, and you can't send a controllable message from one place to another instantaneously.

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