I have a feeling this is 100% Internet.
Look at the player as the music airs, and focus on the bottom of the player, specifically the bar in between the play buttons and the song rating. It goes from white to blue. When the song is finished, the bar turns all blue and the next song starts, with no liner.
Also, every single song appears to have a song rating option, as opposed to the handful of songs on the streams of, say, WYSP, that have this option. That, in addition to the bar, is something I've rarely seen on most other CBS streaming station players, which leads me to believe this is not even on HD radio anywhere. Remember - KYW has no HD2 channels!