He needed $10 million to create Ori. Microsoft provided him with $10 million to pay his developers, plus $2 million for marketing, and then they would share 70/30 of the profits.
The game generated $20 million. Steam takes 30%, leaving him with $14 million. Microsoft wants to recover its investment, so they take $12 million. Now, he's left with $2 million. He signed the 70/30 deal for the profits with Microsoft, so they took $ 1.4 million from the profits.
He's left with $600K, and the government takes its share, which is 50% in taxes. He takes home a $300K bonus on top of the CEO salary he was paying himself from the $10 million budget Microsoft provided him.
He's complaining that he made $20 million, but in the end, it came out to a $300,000 bonus, which is still a lot of money.