I seem to remember back in April someone said they separated it from the standard safety options and had dealers reach out to their customers and change the order to show if they wanted it or not. The window stickers for the ones showing up on dealer lots right now do not have the park-sense self parking listed. Again, totally speculating on this.
Wish Ram would just come out and say, "Hey, this is the issue.....If you want us to ship it without that, say the word! Otherwise, prepare to be patient!!" It would make it a lot easier to be patient with communication.