The problem is not what you power the DAC with. I already use high quality linear regulated 5v power supply for my Topping D50.
The problem is how the DAC distributes and regulates that linear regulated voltage inside the box.
In the case of the D50, only the DAC chips are powered with linear regulators, which is already a good thing, but for the output Topping added a DC-DC switching supply that converts the +5v onto +/-8v.
Whether that is or not audible can only be said after doing what I want to. That is picking the balanced output signal at the DACs,with three wires each, and taking it outside to an external output stage, powered with fully linear regulated +/-15v supplies.
Then we can say the DAC was powered with linear supplies only.
In the case of that small DAC, which I do not doubt may sound good, even if I make that TNT project USB + linear supply cable, the regulation INSIDE the DAC will certainly be switching type. It's how they do it.
Next Black Friday I intend to buy a Topping D10 to use with my PC. The D10 has no separate power socket, DC comes with the USB, and I will do that separation between them.
In that case I don't know if I will modify the output and add a linear supply for it. When the time comes I will have a look.
That Allo Shanti regulated supply you suggested is quite expensive. I would suggest this one:
https://www.ebay.com/itm/273006830343?ul_noapp=true