Oh I've watched it closely several times. Yes the driver stated he was intending to pass the semi in the right lane.
The c is closing on the semi in the right lane, pedal to the floor board. He's passing the semi on his left, but yet as both near the right lane semi the C is no longer passing the semi on his left as quickly.
Whether that's just a change in perspective as the c comes into range of the camera, something that I think I'm seeing but isn't reality or the semi in lane 2 accelerating trying to close out the opening so he doesn't get cut off from the right lane by the MH.
Again, the MH is 100% at fault.