The $8,469.60 includes first and last installments R8Pro. So technically if this is legit, these are counted in the 39 months. (That's if I understood it correctly). I do think that writing $0 down in big and $8k sign up 2 lines later makes it look like something sneaky is going on.
It's also very subjective as to what you call Excessive Wear and tare.
The offer however definitely beats any other lease offer I've seen around for a spider.