I think he is referring to the note left by the Ragnarok's former inhabitants. They say that they thought they had wiped them out previously, and left the instructions on how to kill them in case the infestation started again. However, there is no proof that they did actually succeed in wiping them all out, nor any proof that they reproduced. Think about it. Sure, the crew was able to leave the note, but they weren't able to get back to Earth. They probably killed most of them, but were finally overpowered by the last ones, who you later have to fight when you board the ship.Originally Posted by Ryushikaze
