Work on the Lincoln MKZ / Ford Fusion was made popular thanks to Dataspeed / Autonomoustuff, they open sourced a ROS module but most of their magic is propietary / secret. It's expensive but a lot of startups use it.

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.