Yes, a private branch, very observant.
As for the why, simple, it doesn't work, you can't use it to connect to the Laanx server, and most likely, you won't even be able to compile it. Now no matter how many times you write that in big letters next to the link to a public repository, people are still going to go there and try to compile it, and then come back disappointed or asking half a dozen questions that have no answers yet. So the choice was made to make it a private repository until it at least is a decent working demo.
Also notice however, that private does not mean you cannot get access to it. It is not public, but if you want to work on the code, you can contact Talad, and he can give you access to it.