Have you ever had, or seen, this bike set up with mechanical shifting? The pics are not conclusive, and according to the Redline description, it's electronic (Di2).

The shot inside the bottom bracket showing the open tube doesn't appear like it's positioned for a smooth mechanical cable path. Where does the cable enter the bottom bracket? Are there cable stops on, or in the frame? The shot showing the "hole" in the chainstay transition has it in roughly the right spot but it doesn't appear to me to be for a mechanical cable.

Can you route a mechanical cable through the bottom bracket without interference with the spindle? Maybe you can make this work, but it's hard to say without seeing it first hand. Again, the pics don't tell the story, nor does the Redline sight. The "disc" model is set up with mechanical shifting, and it does say it "Di2 ready" so you may be able to. They could share the same frame. The "Team" frame does appear to have hydro guides on the down tube and chainstay.

Good luck!