This thought just hit me...

Maybe the terms "Nibiru", "The Black Sun", "Destroyer", and "Planet X" don't refer to a physical celestial body...but rather are all referring to Satan aka Lucifer

Isn't Satan referred to in the bilble as some sort of "bright star", and associated with a celestial body?

In the mystery religions, Satan is worshipped as the "Sun god".

He is known as "Appollyon" and "The Destroyer" in the book of Revelation