The line always seems to be things like NXT taping spoilers, betting odds, and anyone who is backstage night of at a show since those are very direct spoilers.
It has been known for a while Kurt is coming back to TV so there really isn't anything surprising that he is showing up at those shows. Even so that isn't a confirmation. Plans always change and rumors have been wrong plenty of times.
Only reason Rock at raw came up because he was only there for the Paige movie and wasn't appearing on the actual show, which is exactly what happened.