I believe (correct me if I'm wrong, please) that Farscry is referring to one of the beliefs that Nibiru is : (choose one, or mix-and-match)
1) home to the Summerian gods.
2) The Messianic star (the star that shone when Jesus was born)
3) part of the Hopi Prophecy of Return (thios is how I first heard about it. I'm part Hopi, and my uncle's are still trying to get me to practice the family religion)
4) home to a Reptilian race, the Anunnaki, who visited Earth and were referred to in the bible as the Nephilim (hybrid sons of angels and women) otherwise known as Those Who From Heaven To Earth Came.
These are a few of the "psuedo-religious/metaphysical" ideas of Nibiru that I have heard. There are MANY others. None of which I am an expert.
I agree that the idea of a "super" planet with a HUGE orbit is valid, but I think Farscry is looking for a discussion of the other ideas.