web: How is state changed without this.setState method here?

    class ErrorBoundary extends React.Component {
    constructor(props) {
super(props);
this.state = { hasError: false };

}

static getDerivedStateFromError(error) {
// Update state so the next render will show the fallback UI.
return { hasError: true };

}

I am not getting how return statement is changing the state if we can't change state without this.setState() method?

web