Tom Taylor today posted an article about Radio Disney on HD, quoting Scott Fybush:
Has Radio Disney ended its national HD Radio deal?
Scott Fybush at Northeast Radio Watch says “Philadelphia is one of several markets where Radio Disney has been quietly airing on HD Radio subchannels for the last few years, as part of an arrangement between Radio Disney and the HD Radio Alliance partners.”
The article doesn't reach a conclusion. No one has actually spoken with anyone at either Radio Disney or the HD Radio Alliance for confirmation.
From my recollection, there were originally two deals, both done 3 years ago, in April 2015. One was with iBiquity, the other with CBS Radio. Both apparently have ended. But so far, no actual statement from any of the principles on the decision.