//Delete all posts of a custom post type with its included post meta data and taxonomies by using wpdb

dcpt.php

function deletePostType($postType = ''){
    global $wpdb;
    $result = $wpdb->query( 
        $wpdb->prepare("
            DELETE posts,pt,pm
            FROM {$wpdb->prefix}posts posts
            LEFT JOIN {$wpdb->prefix}term_relationships pt ON pt.object_id = posts.ID
            LEFT JOIN {$wpdb->prefix}postmeta pm ON pm.post_id = posts.ID
            WHERE posts.post_type = %s
            ", 
            $post_type
        ) 
    );
    return $result!==false;
}

deletePostType('shop_deposit'); // add custom post type slug