I did the LHY filter board and 5V LPS on a new Node N130.Yes it did sound better. A bit more clarity. But it does not fix the bad USB audio out or the mediocre internal DAC.
I found a PI 4 USB into a Denafrips Aries DAC still sounds much better. Or probably into many other mid-tier DACs from SMSL or Topping for that matter.
But it you must spend money on a Node let me suggest just buying the LHY filter board for $110. I found that once installed the Node did not sound any different with a LPS vs a wall wart so it seems the filter board was doing most of the work of improving the sound. I tried it with a $10 wall wart from Amazon that was 5V and 4A which actually surpassed the power capability of the LPS.