Aha thank you, then I misunderstood what the point split does, its purpose is to create clusters then?
In Akira Saito's presentation at 31:02 min. he is using the now depricated vertex split. (in the documentation it says we should use the point split instead, as you did).
https://www.youtube.com/watch?v=ghD79dVZZ_o&t=1766s
It seems to however be used to dissolve some vertices instead, maybe I am misunderstanding the footage.
Which ties into a question @Caskal once asked.
That's basically what I am trying to find out