Rubbish. Both lanes are there for a reason. If everyone kept their distance, used both lanes, and merged sensibly, the traffic would flow far better. The animations in this post illustrate it perfectly.
Correct.
But 'taking advantage' of the empty inside lane is not the 'right' thing to do either (if you want to improve throughput).
The original problem (empty inside lane) is caused by people not merging correctly - but the real problem (reduced throughput and long queues) is not resolved by people like the Merc driver either.