This is not a duplicate, I am not asking about any kind of time dilation caused by a BH. My question is about the direction of time (and if it is possible to have different directions for time, other then back and forth) inside the BH and not its relative speed.
I have read this question:
Where Safesphere in a comment says:
The idea of a black hole being a shell just outside the horizon is well known. However your personal theory of the shell being inside the horizon has nothing to do with physics, but is based on a lack of knowledge or understanding of the Schwarzschild metric. Time inside a black hole doesn't move slower relative to the universe. Instead, time inside a black hole moves in a different direction and for this reason can't be put in any reference at all to the time elsewhere in the universe, not "slower", not "faster", nothing. You can't race to the destination while moving in different directions.
This is a gamechanger. I thought that time's is a one dimensional, single direction phenomenon, that is universal for our universe, and it goes in the same direction everywhere in the universe.
But this comment would mean that there is a part inside our universe (yes if we consider the inside of a BH part of our universe, at least in 3D it is since it is just the inside of a shell), that has a direction for the time dimension that is different from the other parts of the universe.
So this means that time goes in a different direction inside the BH then outside of it. Which direction does it go? I thought that time was just a single dimension, and there are only two ways to go, and going back in time is just a theoretical phenomenon, not actual physics.
But the idea that time goes in a different (not even backwards), but in a completely different direction (like perpendicular direction) is something that is completely hard to imagine without more dimensions.
Is it true, does time go in a different direction inside the BH, then outside of it?
How is this possible, does time not flow in the same direction everywhere in the universe, and is time not a single dimension, where there are only two ways, back and forth?