They might be generalising- a very common (and very annoying) manouever to pull when approaching a junction (talking about cars here) is for the driver to go hard left into what was the bus lane (they tend to end ~100 metres before the junction), foot hard down, up to the lights, then bully their way back into the "main" lane when the bus lane starts again after the junction.
Doing this they "overtake" a large queue of cars, but on the left hand side.
They might be generalising- a very common (and very annoying) manouever to pull when approaching a junction (talking about cars here) is for the driver to go hard left into what was the bus lane (they tend to end ~100 metres before the junction), foot hard down, up to the lights, then bully their way back into the "main" lane when the bus lane starts again after the junction.
Doing this they "overtake" a large queue of cars, but on the left hand side.