Perhaps he's just trying to keep it private and out of his work? When he first returned from rehab, he did talk about the experience some. I thought he had changed quite a bit when I heard him use the word "enable" on the air. I could understand if he just didn't want the topic of addiction to consistently take over his show.
Naw. It permeates your life too much. I can always tell another member of the Fellowship right away.