My Mother always said to me “if you have nothing nice to say - then keep quite”.
The iFi iPower is a switching PSU - and in almost all case’s a capacitor is connected across the Mains and output side to help ease Common mode EMC compliance. Its this Capacitor that causes the large Earth leakage currents typical of switching supplys.
iFi marketing “bump” is all about its low noise performance, totally blindsides the real issue of switching supply which is there Earth Leakage current.
I’ve not tested a iFi Power - so I cannot confirm wither or not they have a well engineered solution WRT Earth Leakage - but I get very suspicious when I read “American levels” of marketing bull…
But one thing is for sure, I’d never use an unsynchronized switching supply in my HiFi system.