I think this is another joke of his. Of course he chosen this colour randomly.
Watch this:
“Ultimately the purple replicator takes over occupying over 9000 of 10000 available spaces. It completely curbs all the other populations. It goes without saying that the environment plays a massive role in which replicator wins.” Indeed because it is their environment for the likes to flourish.
And they know that that’s why even the modern Israelis in Israel are under the ancient pressure of the Orthodox Jews who pop 20 children per a family. The demographic pressure is immense.