That is odd that a major university’s stadium is not part of their campus.
It is odd but, what happened was that Connecticut was trying to get the NE Patriots of the NFL to move to downtown Hartford back in the 1990’s over at the soon-to-be-built Adrian’s Landing. But when that went down the drain, Pratt and Whitney Aircraft decided to step up to the plate since it had shut down the old airport and offered the State of CT some land to build the Rent for the UConn Huskies football team. At least it puts my hometown on the map for a change.
It's not that odd when the university is located in a major city, that already has stadiums for professional football teams. It's a little different than say, Gainesville, which is a University town.