What I saw in the video was Quest the DAC, nothing more nothing less.
Have to say this fetish trying to prove a point with power supply is seriously getting out of hand. There is nothing remaining for those of us common Joes to prove. Even if we do, what possible value is there in the outcome. If someone is interested and they have the funds, and the time, do experiment but bare in mind the findings are relevant only to that particular setup and that scenario. How difficult is that point to understand?
Quest is a game changing DAC at this pricepoint in my opinion (speaking as an owner) and these other low-value, insignificant, overhyped, exaggerated, irrelevant, distractions are taking the fun out of talking about this great DAC.