It is indeed Gilfach Fargoed - too small to have a sign on either platform saying GF so a teleporting alien wold have to look at the highlighted row in the timetable to establish where they are. Also, no BR totem pole here as it is a fair walk down the valley from the top estate.
As far as I'm aware GF still has no station signage but any members from Bargoed or the Rhymney line, please let me know if GF now has such signage.