But any pilot can see the difference when on landing approach.
I think that's the $64000 question here... can they? And even in less-than-ideal conditions?
An example of another airport that got a third parallel runway: In the early days of EHAM's rwy 18R aircraft have repeatedly been trying to land on the "wrong" runway at EHAM and were told to go around, and even on 18R when it was still under construction (big yellow "X") and formally didn't even exist yet, despite NOTAMS of the thing being there and despite the fact that this runway is also displaced in the lateral sense.
So maybe there's some truth to this rumour, maybe there isn't. Rest assured, I have no axe to grind with SIA, but I think you're a little too quick with dismissing this as a joke.