> Here you can see that a car drivers waiting for people cycling are never in the way of other people in cars.

Am I blind or does it only work for just one or maybe two cars?

Bikes are small and fast, and only a small fraction of cars will need to turn here as this is a street going in to a neighborhood. The chances of multiple cars wanting to take this turn and there being a long stream of bikes that holds them up is small. So 'never' is not the right word here, but the times this happens is negligible.

Correct, only one.

This specific turn is onto a street that the article describes as "traffic volume here is low, since only residents will use this street." They probably expect the 1-car buffer to be enough for this intersection. You can see in the video that the 1-car buffer is empty most of the time.

For intersections where they expect more turning traffic (where the one car buffer wouldn't be enough), they add turning lanes that can accomodate more than one car. You can see an example of this a few hundred meters northeast when Graafseweg intersects the Van Grobbendocklaan: https://maps.app.goo.gl/ZmURqawr3oeBX5Sq9

Correct. That is enough 95% of the time. (I made that number up, but it's not far from the truth.)