Exclude page by title for non admins

Get the page by its title, then use its ID:

add_action('pre_get_posts', 'exclude_pages');
function exclude_pages($query) {
    if(! is_admin()) return $query;

    global $pagenow;
    if ('edit.php' === $pagenow && (get_query_var('post_type') && 'page' === get_query_var('post_type'))) {
        // Get the page by its title, ...
        $page = get_page_by_title('TITLE_HERE');
        // then use its ID
        $query->set('post__not_in', array($page->ID));
    }
    return $query;
}

References: get_page_by_title