Biomutant developer Experiment 101 has, as promised, released an update for the game that makes significant changes.
Chief among them is the ability to shut the annoying narrator up. Biomutant's incorporeal narrator is certainly pretty chatty, commenting on pretty much everything you do and translating everything anyone says. Prior to the release of this patch, while you were able to tone the narrator down, you couldn't shut him up completely. Now you can.
Here are the relevant patch notes: