Linkages issue

Why you don't use the penalized linkages in the code below? Is it a typo/bug since you tried your code with no linkage?

https://github.com/gddingcs/Dispersion-based-Clustering/blob/63a0c5294c039ddab18e7f90212de5f3ea17fe3e/reid/bottom_up.py#L310-L311