Ya got me there. I have no idea what that would be, other than pure dealer bulls**t gibberish.
As far as I know, the RCM turns on the fuel pump, it does it's thing and the pressure to the fuel rail/injectors is regulated to 58-60 lbs/sq inch by the internal blow-by spring in the fuel filter. I know of no sensor involved in monitoring fuel pressure or flow.
One would think if there was such a thing, some data on it would be available at the OBD port and my UltraGuage would have a selection for it, but alas no.