Every website on the subject. And every time the game is played the media people discuss it.Where are you getting that? Minnesota v. Wisco has happened every year since 1907.
List of NCAA college football rivalry games - Wikipedia

I believe what they are saying is it has never been interrupted, since the first game.
Where Wisky-MN is the longest continuous, it has had a interruption in 1906 their overall streak of continuous games is longer. But, 106 years straight, 106 total games since the start of the ISU/KSU rivalry, no interruptions.
ie. "never interrupted"