Is passthrough of DSD via HDMI supported?
Neither of the OSMC devices support any sort of DSD passthrough via HDMI - be it DoP (DSD over PCM) or native DSD streaming. Any DSD container that can be played back by Kodi will be decoded to 24 bit 192 kHz PCM and sent to the AVR afterwards.
Keep in mind: The DSD to PCM conversion (not just decoding!) is happening on-the-fly and puts a lot of load on the CPU. Therefore some files may play ok and others won’t (DSD64 2.0 and DSD128 2.0 are mostly fine on Vero 4K/4K +, more demanding DSD versions like surround DSD or DSD256 and more can cause stutter and heat issues, all other devices than Vero 4K/4K + will probably not play DSD fine at all).