I found this review and an interview with the guys behind the consol on the historic "DarkSide" recordings (both original and the latest SACD). The first article confirms the two channel DSD layer on the SACD and goes on to say "This [SACD] release is nothing less than a milestone for the format"
Review DSOTM SACD
Interview with Sound Engineers
Review DSOTM SACD
Interview with Sound Engineers