I found it pretty odd, too. Was it sold out? Maybe it was mostly sold out because of Carrie's 100th appearance celebration so BCB didn't bother to mention it? Still, would have been nice for a longer heads-up to at least hear it on the broadcast. An Opry appearance is a pretty big deal, if you ask me.
Can't say I remember TNN, but we didn't get cable out where I lived. My grandparents had one of those giant satellites in their yard and my grandma would record hours
of CMT music videos to VHS for me to watch. Still have some of them.