Well, Phillipe must be doing something right, he is also praised for his other documentaries. I read some reviews on it, I found one review that touches on the Greek Furies as an allegory to Alien......
"And it expands on a theme that’s often been talked about: that “Alien” was a subterranean feminist horror film — not just because Sigourney Weaver’s Ripley turns into one of the most potent heroines in cinema, but because the movie, drawing on the Greek mythology of the Furies, conjures a symbolic nightmare fantasy of a man getting raped (by the face-hugger) and then, in the chest-bursting scene, giving birth."
Digging further since I don't know much about Greek Mythology, apparently the Furies were three goddesses of vengeance who punished men for crimes against the natural order.
So there's the connection....I guess....kinda....sorta.....i f you squint your eyes. Apparently that's why we see three witches rising through Alien 79's illuminated blue mist.
I guess the next thing I need to dig for is WTF is a subterranean feminist horror film.