I think he means no references to the film Alien -- (Premotheus had numerous storytelling references to the film itself -- the shot of the jockey in the seat, the hyper sleep awakening scenes, "face hugging" scenes, "chest bursting" type scene, flame throwing element, entering the atmosphere elements, etc --I don't know if they had any of those perpetual motion whirly gig type things either...(in alien, it was the birds that dip their beaks in a bowl , in Aliens it was the metal ball things that keep hitting side to side....
The alien and all the other creatures that resulted from being exposed to the "germ" of destruction are just that -- the point was to show that these are weapons of mass destruction and that they were intended to destroy human kind -- the real goal is to stop them from doing it. The dramatic goal of Shaw now is to go to their planet and destroy them before they destroy us