According to the methodology section of the report it is indeed based on the companies’ disclosed policies etc. What is problematic from my point of view though is that Hyundai didn’t even try to comment on the report when they were shown the draft. Sounds to me like they do not care.
I read someone else musing that they must have thought that keeping it plugged in all the time would be bad, so the made it impossible to use the mouse while plugged in. Seems plausible. I suppose it would degrade the battery? Or the cord drag would be bad?