Earlier quoted context omitted.
To be fair, those time limited online games are acknowledged to be biased in favor of AI over human players, so an actual tournament style match like Lee Sedol played would be needed for a more fair comparison. That said, I expect AlphaGo to continue* undefeated (and hope to be proven wrong). *From this point forward.
At this point there's a basically unanimous opinion among Go professionals that humans don't stand a chance unless the time controls were skewed in a very unfair way and/or humans cooperated against the computer. Master's wins in the 60-0 games were extremely convincing (and that was using only 1 GPU).
Sometimes there are also qualitative differences, no human can fly or dive very deep or go to the moon without the assistance of a machine. I don't know if there are qualitative differences in go and chess, like no human can win 60-0 against fellow pros or get to 3400 ELO despite a very large time allowance.