Is this based on the bugged intersection from reddit? Just curious.

Yes, this uses the same technology as the bugged intersection. But I don't plan on making curved bridges anytime soon, they are a graphics nightmare.

It's fine, I was just curious about the functionality.

If this is based of a bug, is it future proof?

The original bug happened (to my understanding) since two curved rails allowed a straight rail to intersect with them with no collision, which allowed the trains to slip past. That bit was fixed.
But as long as this mod sets the collision settings right, the acutal phenomena should continue working.

@Mernom / anyone, can you linked the original reddit post ?
Try to find it myself but no luck.

To what I knew, these are the two posts related to the idea of this mod:
Factorio forum post
Reddit post

Thank you !