He does have a point in that DSD DACs are different than PCM DACs, he is correct that you’ll notice the difference more if you always use a low level on the DS’s volume control. Still, how he expresses things isn’t entirely even handed/neutral: I don’t see a lot of care to make neutral posts on the net 
I think there is an issue that many seems to think a digital volume control is a complete replacement for a good preamp. It’s not. Tho the DS’s volume control is lossless, running systems without level matching will always be a problem. With system level matching the DS’s noise floor isn’t a problem and is as quiet as the noise floors of many systems used to master SACDs…