That's pretty interesting and while I sincerely hope it works as advertised, what is the repair process when (not if) the connections inside the wall fail? As the owner of multiple homes, a part of me is very skeptical that those connections will last for decades untouched.

In the US, code does not allow for splices and connections inside walls, period. In a pre-fab, I would like to see all of the cabling run inside tubes so that I can fix/add/replace easily myself in many years down the road. This is prohibitively expensive for residential mains wiring but not terribly unusual for low-voltage stuff like coax and ethernet that the homeowner can do herself.