This.
I also noticed while watching the game last night that the side reporter was talking about the extension, and the timing of it being announce, and that GT said the extension and timing of the announcement were CB's idea because he wanted the team and recruits to know in the middle of the playoff run that he was in with NDSU for the long haul. I'd have to watch it again to get the exact quote, but when you combine those two it certainly points to him not being interested in leaving anytime soon.
The guys in the booth also made a number of comments on how happy they could tell that CB is in Fargo after talking to him during the week. I put much less into anything that those two said though.