The GELFs filled the restaurant where the Cat ate fish directly from a fish tank and Lister ate caviar vindaloo with a banana bomb, and they were waited on by the BTL Guide. Although the scene transpired in virtual reality, the restaurant and GELFs were presumably re-created from Lister's memory of his favorite (or most desired) restaurant in Liverpool on Earth. Otherwise, it is likely to be programmed based on a pre-existing location from three million years earlier. It is therefore likely the GELFs were, or at least had been, real.