Hello banning staff here. From examining the clip, it looked intentional to me. You sped past the vehicle, then went full speed backed up into the car. Even continuing backing up after he died. While this is not always going to blow up the vehicle, in this situation you initiated and followed through and caused a death.
You had previous offenses for the same thing and your behavior in the sit, I believed to be mingey and lack any sort of remorse. Simply insisting it wasn't your fault and refusing to take any sort of responsibility for the incident that you caused. You currently have 6 bans and 2 notes in 11 months, if this was a first offense, I would have been more lenient. But considering that, and I don't believe this to be an accident or bug. I think this was more than fair.