What she means: if the detention room in Sky High neutralizes all superpowers, why didn't super villains utilize that same technology in combat? Specifically, why didn't Gwen Grayson/Royal Pain apply that technology to the homecoming setup implemented to congregate all super-teens and commander and jetstream to one location? Being a technopath, it should have been easy enough to duplicate the same technology and use it during homecoming, especially since she had such direct access to it while posing as Gwen Grayson, the most popular girl in school.