What if one pursues a PhD from a university campus which is not the main campus, rather in a different city hundred miles away. The certificate is given by the main campus authority. Is there any discrimination towards the graduates?
Often a university will have many campuses, and some campuses will be much more prestigious than others. (One well-known example is the University of California, Berkeley, versus UC Merced.) In that case your degree will generally be more highly regarded if you go to the more prestigious campus.
However, I think the example you mentioned does not fall into this case. (After reading the link you sent, I couldn't quite decide, but I got more information from the wikipedia page for UNSW.) So in your case, I would ask about which resources, particularly classes and faculty members, you will have access to. Elsewhere I've written about why you should go to the best grad school you can get into. One big reason is networking and another is the culture and mindset you will absorb from your classmates and faculty. Even if you have the same degree on paper, many people will know (or think they do) if there's a difference in the quality of your training.