PC P&C might call it the Silencer, but I doubt proper "silence freaks" would. This is for a number of reasons:
1. fan is a 'budget' ADDA Dual Ball bearing (ADDA AD1212HB-A71GL), which can spin quite fast (2200RPM) and occasionally (some fans do, some fans don't) has bearing noise.
2. efficiency, which while good, is not the best you can do nowadays. The theory is that more efficient units have less heat to deal with, so the fan used can spin slower compared to a unit with lower efficiency.
3. PC P&C's actual marketing for the unit paint it as not that quiet: 20-37dBA. So possibly even the idle noise from it wouldn't be good enough for some people.