The Kartarpur Corridor DOES connect the two towns. It does not matter who is allowed to travel or not, the can be specificed in the notes or the road access can be specificed.

One example being the Russo-Ukraine border highways - which are obviously defunct and crossings no longer take place, however they are still classified as Grand Trunk Roads. This, albeit, is not a grand trunk road, it is a primary/secondary road. 

Like I said - it is called "Guru Nanak Highway" for a reason. I see that you've also changed the road classification on the Indian side - which again, I have no idea why because it only seems to be of your opinon.