“Since global structured pruning doesn’t make much sense unless the norm is normalized by the size of the parameter, we now limit the scope of global pruning to unstructured methods.”
This is written in Pruning tutorial. It says that the norm used to prune globally does not take into account the size of the parameter. Thus, it would just remove small parameters.
Check this https://github.com/JJGO/shrinkbench 48.  Maybe they have global structured pruning.