In responding "Yes" to your original query, I may have spoke too soon. *Channels-DVR is new to me!
I don't have an HDHR tuner to test with, so I'm not sure what the data will show... DeviceID populates when a recording is happening... the "source" I noticed in the json is not the same thing.
I'll keep looking. Maybe I'll have to buy a tuner to play with... haven't done so because where I live there's almost NO watchable channels OTA... I'm kind of in a dead zone without raising up a high arial, which I cannot do (not my house).