Assuming he owns the place, not much you can do. Definitely keep your code in version control, or at a bare minimum back it up with an automated script or something.
If he doesn't own the place, going over their head is an option but a bad one for your longevity at the business.
I'd say let em do what they want and revert it if you don't like it. You guys could talk about starting to enforce pull requests as the only mechanism of getting into prod, then your dev team will have a chance to review every line before they go into prod
Cool, on mobile some of the categories are unreadable