I'm a lefty, and I don't know if the safety is reversible. But, I'm not real sure why it would be needed.
Works the same as for a righty, the thumb of my firing hand pushes the safety in one direction, and the trigger finger moves it in the other direction. Never a problem manipulating it.
As far as I can tell the stock AUG safety works equally well for left handed and right handed shooters, it just works...in reverse.