The million dollar question of 'how did Fincher make it' isn't addressed at all in this article. Everyone who wants to direct, watched films and decided to go for it. Everyone works or worked as a PA with a 'no job too small' attitude.
Here's where it skips over what's relevant:
"He launched his company, Propaganda, with a few other filmmakers. They started making music videos and billing around 2-3 million dollars."
Uhh... hello ... this is the part we want to know about. How do you go from launching a company to billing that kind of money? Did they do specs? Did they know someone? The answer is hidden somewhere between these two sentences. Get the answer, and then tell me how Fincher made it.