While this is super impressive we should not forget - it was just a single matchup (1/9, requires a lot of adaption; especially on the three races) on a single map (1/N, granted in SC2 the maps are not as diverse as in the original StarCraft) using a single (outdated) patch. Humans are still master in knowledge transfer playing an unknown map and lesser known matchup with greater precision. Once an AI reaches a level where knowledge is transferred more efficiently than what we are capable of I will start getting worried - not beforehand.