Due process is an abbreviation for 'due process of law'. It refers to how the law is enforced and adjudicated. It does not refer to the enforcement of private contracts like Codes of Conduct.
It's no surprise that university and college CoC enforcement differs from law enforcement since they are two different processes for enforcing two different sets of rules derived from two different sources of authority.
It's the same for law enforcement and CoC enforcement at my place of work. The cops aren't going to arrest me if I fall asleep at my desk, and my employer isn't allowed to imprison me if I steal office supplies.
Ok but I see from googling that the term is apparently used in this context. There is a wiki page on 'Campus Assault Due Process' for example.
From what I've seen, people who oppose the change in the way sexual assault complaints are handled on campus follow one of three lines of attack. The first is to attack the legitimacy of the campus disciplinary process. This usually involves criticizing college and university administrations for investigating an alleged sexual assault because they aren't part of the criminal justice system. Many posters have claimed colleges and universities don't have adequately trained staff to do investigations, although its been shown that all of the larger ones do. This is where the conflating of due process and disciplinary process keeps happening, mostly I believe because it appeals to a reader's sense of fairness. It's a fallacious argument that ignores the fact that colleges and universities aren't enforcing criminal law, they are enforcing their
rules, and they can best do that through their disciplinary process.
The second line of attack is to assert bias and gender discrimination. There is a dearth of evidence in support of that argument so on this board it usually morphs into an attack on the legitimacy of the disciplinary process.
The third line of attack is to question where exactly the lines should be drawn between consensual and non-consensual sexual activity when both parties have been consuming alcohol or drugs. This, I think, is where the rubber meets the road. But it's a discussion that calls for nuance and acceptance that there are no hard and fast rules that apply in all situations. It can be very frustrating but IMO it's the discussion worth having.