So, basically, this route is a reference to the authors other work, a novel by the name "The ENU Zone"
To get this ending, you have to perform a very specific sequence of actions throughout the play through, which are basically memory triggers/references to [SPOILER]Aidan Heisenberg [Host]/Isaac Planck/events therein
1. Logarithms: take the rude I literally do not care path, but do not kill him.
2. Algebra: sometimes, you have to find u before you can find x.
3. Statistics: you talk like an evil scientist.
4. Mobius Strip: my worst decision was shooting those 12 people in february of 1998.
5. Klein Bottle: I'd tell them immediately. -> cry about it. -> maybe I did. -> yes.
6. Sierpinski Triangle: how would you even know that? -> eventually fine, I did it.
7. Gabriel’s Horn: I've killed people before.
8. Hilbert’s Hotel: enter room 137.
This gets you, at last, The Real Ending