My 2013 PP acts the same way as yours jmr061.
Always has and I've never seen "sport mode" displayed. I thinks it's still working though.
I'm I have a short S turn (2 90 degree bends) that's great for testing. I can tell the difference between Traction Off, 2 button press traction off, and 5 second button hold. I will hit this bend around 50 mph and then try to accelerate hard through them to test these modes. The sport mode will still allow me to accelerate through the bends with just some tire spin but won't allow the car to get sideways or under steer much. The 5 second everything off is a little hairy and will actually allow the car to fish tail or understear, depending on my driving.