You know that there are plenty of other reasons for someone to move on from their job other than 'their bosses are arseholes' right? If I remember rightly, this was the guy who left to start brewing beer, so just maybe, after so many years of working in the videogame industry, he was just burned out and wanted to try something new. Even if that not the case, the possibilities are still wide open. Perhaps he moved house somewhere further away and didn't want to commute, or perhaps there was a change in family priorities, and so on and so forth.
Remember, this guy isn't beholden to EA anymore. They're not paying him, he's not under contract. In short, he owes them nothing. So, if he had anything majorly negative to say about the company, what exactly would be stopping him from coming out and saying it?