You don't know whether or not someone was fired for it or not. They aren't obligated to do everything in their power to appease people like you who jump to wild conclusions based on a single piece of flimsy evidence because chances are you would still go on trying to sustain this weird narrative anyway.
This isn't 2016 anymore. Nazis and white supremacists don't operate in hiding. They're in seats of major power. Believing they're secretly in control of a niche gaming market based on an email and a nonchalant response is just cringe behavior from people who need to touch grass.