I think they do have; as I also filled up the secondary application. That was just survey type, with simple questions, like (i) why you are interested in PhD at UTSW? (ii) what type of research are you interested in? (iii) List 5 faculties. Not sure what are their purposes, but I guess, those questions were not in the online application system and they feel to ask again and surveyed, although SOP covers all those questions! Wondering why then everyone didn't receive that email?