Steering by wire --> none of the cars you listed have steer by wire. Nissan is the only OEM who has steer by wire in production. Brake by wire --> does not exist at all.
The work that you point to is what we now know "openly", and yeah, there is only a few of us and I am one of the firsts sharing their findings on that specific model. There are a ton of people who know what we yet don't know but they don't/can't share it publicly.