@soix - your question includes multiple other components. Please re-read my information. I said bits come identical from $50 device and from $50K device. It is trivial to verify having proper equipment.
Now, you are changing this to "sounds different". In this case you have to consider the entire chain. Maybe DAC is over sensitive to RF noise? I don't know. "Sounds" is subjective. Did they stage experiment properly? Who knows.
I know that amp that looks nicer to me also sounds better to me :-) and this is normal since our perception is not isolated.