This was my thought, but the mechanics used to work with pro scene so I can gather he does things by the books and sometimes it's hard for them to think outside the box.
Should be a lot simpler than in the video since most of the Di2 is connected in the handlebar instead and only one wire is going into the frame, last TT bike repair I got had same brakes, 2 junctions behind the stem and 8 cables going inside the cockpit, now that was an ordeal.
This was my thought, but the mechanics used to work with pro scene so I can gather he does things by the books and sometimes it's hard for them to think outside the box.