They have been remastered at the higher bit rate but are still standard PCM. The 24/96 re-issues are generally quite a bit better sounding but DAC's do not see them as more than 16 bit. It is just like the CD's that you have that are recorded at 20 bit, just better sound.
What is the story with 24 bit masters 24/96 .
I received some new (old) re-mastered classical CDs that have "Mastered with 24/96 Technology" splatter all over the front cover and liner notes. My DAC still lights up that the CD is standard 44.1 redbook (MSB). Does this mean that the second letter in ADD is all that is 24/96 and the final product is sampled back to 44? Is there something else wrong? Are there really any standard CDs out there that play at 96 Mhz ???