Assuming every PC copy sold is digital at $60 a pop the 70% publisher cut would be $42. To generate an extra $300,000,000 in revenue on PC it'd have to sell 7 million copies. No game in the history of ever has sold that many copies on day one on PC. And they especially haven't done that when the game is releasing on consoles at the same time.

It will however eventually release on PC and generate a nice chunk of change over a few years at various price points.