It's one of their trial site things; I doubt they expect people to go directly to it from HN, they expect people to know that these products don't actually exist yet.
Yes, because it's one of their trial sites. It's supposed to look exactly like the real deal, but not actually work. Normally you'd get to it from a blog post or landing page explaining this.
No, I can't actually find one for this product. I don't know how they announced it, however. It does seem to be the same kind of trial thing they've done in the past though.