Hold on, hold on. Stop panicking and breathe. It's totally not true. Charles's Facebook page encountered an error yesterday (10/27/16) saying that he was formerly the voice of Super Mario.
I'm sure all Mario fanatics can agree that Mario would never be the same again without his voice.
Good thing Charles confirmed later on that the Facebook mishap was indeed an error and wasn't his retirement from the role at all. Wahoo! It's always Mario Time for Charles! And we're certainly happy that he is continuing and that this was all a horrible mistake.