The original blogger posted several things, and provided these links: List of Cognitive Biases, Cognitive Distortions, Woundology, and Maladaptive Schemas. The outgroup homogeneity bias was on the list of cognitive biases.

The cognitive biases and cognitive distortions seem to me more clear-cut and less fuzzy than woundology and maladaptive schemas, although there’s some important points made in the last two as well. The woundology and maladaptive schemas articles make important points but seem more approximated and force-fit than the first two.