That doesn't discount what Grench said. You asked two questions and only got one answer.
This is supposed to be the "final" layout (pending tweaks and bug fixes) which suggests that the traces are going to be there, they just won't be populated. Unless it isn't the final layout and these traces are going to be removed from the FINAL final board, but that means another round of tests (without the debug stuff) before production.
There's no cost to having them unless removing them reduces the number of layers required, so it would make sense to me that they stay: used for debugging for now, maybe more in the future.