I’m running out of ways to phrase this. They become related the moment the federal government requires your university to take specific action regarding specific infractions.
If the federal government didn’t require Duquesne to investigate and didn’t require a specific standard for guilt while engaging in an investigation, you would be right, the two investigations would be entirely unrelated. At that point, I would still personally believe that universities should be prohibited from doing independent investigations on matters relating to felonies, but that personal belief wouldn’t be directly relevant to this discussion.
But that isn’t the case. Until this morning (yesterday?? I lost track), the federal government was requiring Duquesne to investigate and judge these specific actions based on specific standards of evidence. That requirement by the federal government intertwines the state response to the accusation and the university response.