In some slightly more positive news I've recently found, Irons1ghts, the leaker, has returned to making Helldivers content and is now working on a mod loader, which will allow adding entirely new content, like new enemies, new missions, new weapons, and more, and has confirmed porting cultists will be possible when someone asked. He plans to open a patreon so fans can support this project which will likely take a few months to be complete.
So if we ever want to have cultists in the current game, this is likely the only way it's going to happen fellas.