[morsch]

It wasn't obvious to me from those quotes: this study is an analysis of an online survey the authors posted in Tesla forums and I suppose on Twitter. It's not based on anything like neutral observation of real behavior.

"We conducted an online survey with 162 Tesla Owners. The survey was distributed through online forums and social media during April-May 2016. The survey asked questions about drivers’ attitudes towards and experiences with two functionalities built into Tesla Model S cars: Autopilot and Summon. Questions covered frequency of use, satisfaction, ease of learning and knowledge related to Autopilot and Summon. Additionally, we asked participants to report unusual or unexpected behaviors they experienced while using these systems and what they consider a key aspect of safety. The average time to complete the survey was 9.6 minutes."