Besides superhuman speed, AlphaStar could see the whole map at once unlike the human player. After beating human 5-0, they had extra exhibition match with new version of AlphaStar that had cameral like vision where it had to look around, and AlphaStar lost that game.

AlphaStar has till way to go before it can beat top human in a fair match.

I found this analysis by u/SoulDrivenOlives very interesting, so I thought that maybe here people would both find value in it and add in some of their thoughts. I recommend reading it all if you're interested in the recently displayed AlphaStar SC2 AI.