If you look closely at the video you'll see how the Tesla curiously centered on the middle lane at 0:08 before it went back into the original right side lane again. There's very few drivers who'll have the skills (and interest) to perform two evasive maneuvers in 3 seconds the whole incident took
and center on the lane they are spending about 1 second in ...
But to the FSD code driving the car it's just another workday in the computer: there were ~800 milliseconds spent in the middle lane which is plenty of time to center on the lane.
It also takes significant skill and steel nerves not to overreact here, to not steer to the left too much, to not oversteer and fishtail. Instead all three legs of the driving maneuver were performed almost perfectly, taking the dynamic properties of such a violent maneuver perfectly into account.
Based on that I'd guess there's a significant chance that this was a variant of the "Emergency Lane Keep Assist" FSD feature, which was activated last week IIRC.