Earlier quoted context omitted.
This makes no sense to me even after assuming you are from a country that drives on the left and reading the Wikipedia page.
First off, note that hook turns are a bike thing, not a car thing — trying to imagine it with cars isn’t going to make any sense. They rely on the fact that bikes are small enough that they can fit in the space in front of the stopped opposite-direction cars (which might be a crosswalk, bike box, etc). You just go stop there, turn your bike so it’s pointing the right direction, and wait for the green. They work even…
https://www.youtube.com/watch?v=Yh92LirlCf8
My wife used to drive in the Melbourne CBD daily for work, but would always go around the block instead of attempting one.