I think maybe parent comment is referring to it essentially just employing a zerg rush but with the speed and reaction time of an AI?
Not 100% sure...
Unrelated, iirc the starcraft functionality was an early example of generalizing a pretrained NN, alphaGO, and showing that it could adapt to learn and defeat games across strategic domains, especially after it learned so much strategy from the most difficult, widely played, and most strategically-varied physical game available.