I lived up there for a few years, and have some good friends that are fans of the team, but delusional doesn't begin to describe their fan base. They were like that when they were a D-2 program too. D-2 is arguably the least relevant level of NCAA football, yet to listen to them, you'd think they were Notre Dame under Knute Rockne or something. They're no different now that they're in FCS, only possibly more annoying.
Here's a little reality check. NDSU plays at a level of football whose title game is played in a non-descript suburb of Dallas, in a MLS soccer stadium that holds about 20,000 people. I think that about sums it up. And two of the most prominent conferences at that level don't even participate in the playoffs at all. (Ivy League and SWAC).
I've been to games, and it's kind of fun, and the fan base is excited, but it's not major college football.