It's not really necessary to define it as a sport or not, in this context. The goal, I think, is official recognition.
Minnesota has that - we're officially recognized by the Minnesota State High School League, the organization that basically runs all of the interscholastic activities and sports in the state. You can see a summary of what they run
here. As far as that goes, there seems to be two areas - sports and fine arts, and robotics is lumped in with sports.
And, as they say, "Minnesota is the first high school association in the country to host a state tournament in Robotics."