This is 100% true. I graduated high school in 2009 and about 50% of my class (who proceeded to achieve a post-secondary education) went to NDSU, 20% went to MSUM, 10% went to M-State Fergus Falls, 10% went to the U, 5% went to Concordia - Moorhead, and 5% went elsewhere. Graduating class was roughly 140 and was within a 60 mile radius of Fargo.
The only place where people would die to go/play for the U is in the cities. That's it. Most of the state outside of the cities will cheer for the U for almost every game, but are rarely in a "OMG MY GOPHERS BETTER NOT LOSE LEL" state of mind.
Now if we were to talk about the Vikings, all of MN, ND, and SD would be crying for them to win...
Of course more went to those schools. They are closer, and a lot easier to get accepted to. All my friends that went to those schools were still fans of the Gophers, except in hockey for the ones that went to UND.
And an example of a NW town caring about the U is when Mollberg from Detroit Lakes was being recruited by the Gophers. The whole town was talking about when the coaches came to town to watch him work out. Everyone was buzzing about the possibility of him playing for the U. When the U cooled on him, all the talk died down.