I wanted to add the observation that all the restricted heroes are ranged. Necrophos, Sniper, Viper, Crystal Maiden, and Lich.
Since playing a lane as a ranged hero is very different from playing the same lane as a melee hero, I wonder whether the AI has learned to play melee heroes yet.
Not only are they ranged, but this lineup is very snowball-oriented, i.e. the optimal play style with this kind of lineup is to gain a small advantage in the early game and then keep pushing towers together aggressively. The middle-to-late game doesn't really matter. Whoever wins the early game wins the game. And we do know that bots are going to be good at early game last hitting.
Since playing a lane as a ranged hero is very different from playing the same lane as a melee hero, I wonder whether the AI has learned to play melee heroes yet.