The smaller the effective stacks, the better it would be for a bot. For instance, below 15bb stacks, a bot could just play nash equilibrium and be unexploitable. By definition, the human would have to do the same, or become -ev by deviating one way or another.

The fact that every hand starts at 200bb's in this challenge is actually very good for humanity.

On another note, it's very interesting to see that the bot found independently that huge overbets on the river are close to optimal. This is something that only recently some top HU pro's started incorporating in their games.