I've seen this confusion in many forums. "Digitally controlled" level controls doesn't mean they operate in the digital domain. The signal is analog, only the level control chip is being given a number on a control bus instructing it how much to attenuate.

Big names like Krell use these type of volume controls instead of a motorized "classical" potentiometer in some of their stereo integrated amps and not only.

Definitely the fact that you can adjust the levels independently doesn't imply an ADA chain in the signal path.