Not compatible with child themes

Which functions in particular would you like to override with your child theme?

Okay I see. Here’s what you can do:

Update the function shared in the other thread to this:

function ct_author_child_remove_wp_version() {
  remove_action( 'wp_head', 'wp_generator', 1 );
  remove_action( 'wp_head', 'ct_author_add_meta_elements', 1 );
}
add_action('after_setup_theme', 'ct_author_child_remove_wp_version');

That will remove the theme template tag, but it will also remove two other meta elements your site needs. So add this function afterwards to re-add those other meta elements:

function ct_author_child_add_meta_elements() {

	$meta_elements = '';

	/* Charset */
	$meta_elements .= sprintf( '<meta charset="%s" />' . "\n", get_bloginfo( 'charset' ) );

	/* Viewport */
	$meta_elements .= '<meta name="viewport" content="width=device-width, initial-scale=1" />' . "\n";

	echo $meta_elements;
}
add_action( 'wp_head', 'ct_author_child_add_meta_elements', 1 );