When I present what I have, I usually use a bunch of different slides to slowly build up to that middle graph - so it's not just you.
Do I understand that correctly that public transport is actually not that bad compared to a car (as the red dots cluster not so far from the car dots)?
Yep! Remarkably close is my observation. My study area is highly urbanized and public transportation is generally really good here, so I would point to those as explanatory factors.
The time it would take to park your car and walk to your destination is accounted for partly - it's taken into account as a rigid amount of time on top of the actual travel time.