Are you sure about this? On reclocking. USB yes, things like S/PDIF or Toslink, certainly not.
You are all more aware of the technology of these units, but from the description of my ancient (but modded) Museatex Meilor Bitstream DAC first introduced in about 1992:
Museatex (Meitner) implemented the "C-Lock" circuitry back in those days to address poor jitter performance through the S/PDIF.