Question regarding SEO

Hi, if we activate the SEO index blocking snippet, does the post/page will be reindexed after we unhide the post/page ?
Best regards!
Julian

function add_meta_for_search_excluded()
{
    global $post;
    if (false !== array_search($post->ID, get_option('sep_exclude', array()))) {
        echo '<meta name="robots" content="noindex,nofollow" />', "\n";
    }
}
add_action('wp_head', 'add_meta_for_search_excluded');