Ah yeah, back then the ships still had NPCs standing in front of them you could talk to, who would then send you to the WIP areas. However, in public build 0.13 (I think) the NPCs got removed, so you no longer can sail there, at least in the public builds. They are still available in the Patreon builds though, which is why we didn't remove that bit from the walkthrough, since it's based on the most recent Patreon build.