He went to a party where Andreessen Horowitz happened to also be attending. I'm assuming he didn't crash this party. I didn't say he was born with a silver spoon in his mouth, just that he was in a position where his hard work was likely to be recognized.
And that kind of stuff does happen, just look at people who win the lottery :) But even in that simple example those people still had to play.
Luck, or what appears to be luck, generally happens to people who are constantly prepared to accept an opportunity when it presents itself. In fact this leads to another popular saying that opportunity is everywhere. The problem is that it is often dressed in overalls and looks like work[1].