I should've clarified originally ... I knew he wasn't part of the "title" of the BlackStar album but I thought he was kind of an unofficial member and was the sole producer on that album, or at least that he did the vast majority.

I was wrong. And once corrected I realized that I actually was well aware that there were several producers who took part in the BlackStar album.

Getting old and forgetful sucks. Haha.