Very cool video! its crazy how quickly the injectors spray gasoline. But I don't think you can compare the sound from the video clip to a fully assembled idling engine. The injectors will be within the engine block and will clicking noise will sound different.
I am trying to find the thread on it, but I thought we all aligned on the ticking noise coming from the passenger side of the engine (at least on US cars) being a result of the engineering differences that bank uses due to cylinder deactivation. Certainly could be wrong here, but that's the only place I've heard ticking on at least four different QVs. This is not to be confused with "pulsing" that is heard from the injectors.