Something really strange while watching Alphago Kim Seong-hyeon's YouTube...?

Of course, since Kim Seong-hyeon is overwhelmingly superior, he is better at control, macro, and production, and he can probably expand early with extreme defensive capabilities.
But no matter how you look at it, both Kim Seong-hyeon and his opponent start with the same 4 workers,
yet how is it possible to do things like a no-gate 4-Nexus right after starting...
or going for all-multiples while the opponent is taking their natural expansion.... lol
How is this even possible.....? Even while watching the videos, I can't believe it.
As those who have played StarCraft know, no matter how much worse the opponent is than you,
if you play like that in a real match, you will definitely be punished.
Just how good is Kim Seong-hyeon that he can expand so impossibly?
Once he has established an advantage, whatever he does afterward—whether it's trolling or anything else—is understandable,
but it's truly amazing how he can expand that much and still not get crushed.
Simply incredible.