Move Author metabox to Publish Metatbox

<?php
/**
 * Move author metabox to publish metabox
 *
 * NOT with Gutenberg enabled {use @link https://wordpress.org/plugins/disable-gutenberg/}
 *
 * The first function will remove the original author metabox
 * and the second function will add the author metabox to the publish metabox
 * The first function will also do a check for if( is_admin) so it will only run
 * in the back-end.
 *
 * Read more {@link https://codex.wordpress.org/Plugin_API/Action_Reference/post_submitbox_misc_actions}
 *           {@link https://developer.wordpress.org/reference/functions/remove_meta_box/}
 *           {@link https://developer.wordpress.org/reference/functions/add_meta_box/}
 *
 * Works with WP @version 5.0.3 and below
 */

/**
 * Remove the author metabox
 */
add_action('add_meta_boxes', 'remove_author_metabox', 999);
function remove_author_metabox()
{
    if( is_admin() )
    {

    $post_types = get_post_types();
        foreach ( $post_types as $post_type )
        {
            remove_meta_box('authordiv', $post_type, 'normal');
        }
    }
}

/**
 * Add author metabox to the publish metabox
 */
add_action( 'post_submitbox_misc_actions', 'add_author_metabox_to_publish_metabox' );
function add_author_metabox_to_publish_metabox()
{
    ?><style>
    .misc-pub-section {
        border-top-style:solid;
        border-top-width:1px;
        border-top-color:#EEEEEE;
        border-bottom-width:0px;
    }
    </style><?php

    global $post_ID;
    $post = get_post( $post_ID );

    echo '<div id="author" class="misc-pub-section" >Author: ';
    post_author_meta_box( $post );
    echo '</div>';
}