I used the links you provided and uninstalled everything (in safe mode) then reinstalled core + PhysX using the slimmer. Rebooted and the error was still there.
I then attempted a system restore going back far enough to a time when this error didn't occur. The system restore failed - but the error is now gone

Edit: As a last resort I did install GeForce Experience before that last reboot, so maybe that's what fixed the DLL error?
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