Far as I can tell, this was all concocted by a bunch of stoned hippies back in the seventies, except for one thing, which is either provably true or false: Galactic Alignment.
At one instant on that day, all the planets will from a straight line to the sun or somesuch. If that’s true, it would seem to me that if a pole reversal can happen, it would require something like that to do it.
As for Niburu flying into us, I find impossible that it could have hidden all this time. If it was there, we would have seen it by now.