I know they have said they will be limiting the maximum APM of the bot to around 180 for the final bot but they may not have implemented it at the time this was happening.
Edit: another example https://www.youtube.com/watch?v=IKVFZ28ybQs
As far as I can tell, the AI must be cheating, at the very least to obtain map vision beyond what is available in a match. In order for the zerg AI to observe each tank's turret rotation and predict which zergling it's about to fire on, zerglings have a sight radius of 8, smaller than the tank's 11. In a fair match, the zerglings would be fired on before getting a chance to see the tanks. Even as the group of zerglings gets close enough to see the first tanks, other tanks start firing from beyond the zerglings' vision, so I'm not convinced this AI could pull this off in an actual match.
I'm not sure there would need to be that large a skill difference, relatively speaking - worker micro has a really high skill ceiling, and players start with 12 workers instead of 6 nowadays, so 2 extra is a much smaller difference.
Evenly matched armies looking for a micro-based edge turns basically into a fighting game like Street Fighter, where it's about reading your opponent, baiting them into a mistake, pre-empting them, taking decisive action, crisp reflexes/timing, doing something unexpected or unorthodox to get an advantage at a huge risk, etc.
Especially in ZvZ where spine crawlers can be built, it's not an auto loss -- it's a bet that the opponent is playing a little greedy, and a chaotic fight.
That's not a worker rush, that's an early pool where you brought some drones.
If it is a viable strategy and not a real edge case to punish some maximal greedy strategy, the game should probably be patched.
It meant that the AI actually found a working strategy against one of the standard bots, where it had not found any before.
It will probably never work when it starts to play against itself, but we don't know if the AI is already at that point.
..what? Thats an absurd consequence -- sc/2 has a hundred different ways to rush, and they all come with the note: if it works, you win, if it doesn't, you're dead. And everyone accepts it. What's so special about drone rushing that it'd receive such consequences?
I mean hell, there's Has specializing in cannon rushing and goes damned far; but drone rushing? No, thats just too much!