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They fail to explain how the rear brake hose is routed through the steerer.
Looks like it comes out of the bottom of the steerer then in to the frame with a port on the down tube. Look at 1:03, you can see the hose doubling back in to the frame.
I don't think they've drilled anything, I think the stem is specific in some way.
Magura integrated mtb brakes
https://youtu.be/iJC48niYPxY