I checked the video from start to finish, to get your question correctly. I’m not sure if I follow here.
You take a Cloner Object, and in the moment you place at least one object as child under it, it will be cloned, i.e., clones appear.
If that is not the answer to your question, please share the video’s time where you got stuck, and I will have another look in it.
All the best
Since R20 works rather with “Fields” than with “Weights”, I took the liberty to “translate” the two examples freely. Freely means here, that there are certainly many more variations possible.
As a side note, the Multi Instances introduced in R20 will certainly supportive here.