It sure is a weird way to advertise something. and with all the actors in the PR for it, which you wont get on the day. I was hoping for new train shells sadly not..
See, the idea of the safe zone is that they have "taken over X" so the remains of old X being there can work from a story point of view. despite it coming across lazy and cost saving.
I do agree, they could have created their own IP relating to the music and old X, a better music and light show throughout the attraction. Like rockin rollercoaster. done something that was actually pretty neat. some video wall at the blocks. using lights and sound to make the coaster feel faster. With the budget, some pretty neat stuff could have been done! But instead gone for a decreasing in interest IP. god knows what happens in 2 years time when walking dead is dead.