Also, the generated rooms look much like the sort of rooms one would build with cob. A cob schoolhouse could be awesome.
You need good sightlines for the kids, room for desks, and need to ensure kids aren't isolated in a corner. Plus light (not just to a small courtyard), ability to escape in case of fire or other emergency!!!!!!! and for minimal noise intrusion from other classrooms.
Minimal space and building material are just not the right constraints and speak to absolute ignorance of the actual problem on the part of the designer.
He even clearly states his goals: The creative goal is to approach floor plan design solely from the perspective of optimization and without regard for convention, constructability, etc. The research goal is to see how a combination of explicit, implicit and emergent methods allow floor plans of high complexity to evolve.
Nowhere does he claim this is an implementable solution, or meant to be one... just an interesting one, given a set of priorities.
As pointed out by commentator from the r/ML subreddit, the plans resemble biological arteries — which intuitively make sense given that the objective was to minimize distance to nearest fire exit. The analog is that arteries try to maximize surface area to volume ratio to ensure blood flood.