You're telling me that more than 2/3 of TV viewers in Iowa (more than this actually as I'm just comparing to Iowa's population) were watching this game last year (plus a few more)? I know we like football in Iowa, but that seems remarkable...
https://www.sportsmediawatch.com/college-football-tv-ratings/#2018wk2
IM not sure what you said but I am telling you Michigan State vs Arizona is national and will most likely have more national coverage and more national viewers than Iowa State vs. Iowa.