I recently bought a 202/200 (had them before), came with a NAPSC. Ran them for a while until a TeddyCap Plus (HiCap + NAPSC) came up used, connected just the TeddyCap part and left the NAPSC in place, couple days later swapped the NAPSC out so just the TCap + was powering things. Zero change/difference. Sounds like one of those forum myths to me.
The Teddy power supplies are excellent vfm and it’s not uncommon to prefer them to the Naim ones, I did when I was climbing all the way up the Classic range.