PHP-fpm이 안됩니다

https://tecadmin.net/setup-nginx-php-fpm-on-ubuntu-20-04/

위 글을 보면서 따라했는데 제 사이트에 접속해보면 

<?php
/**
 * -----------------------------------------------------------------------------
 * 
 *        R H Y M I X  :  C O N T E N T  M A N A G E M E N T  S Y S T E M
 * 
 *                            https://www.rhymix.org
 * 
 * -----------------------------------------------------------------------------
 * 
 *  Copyright (c) Rhymix Developers and Contributors <[email protected]>
 *  Copyright (c) NAVER <http://www.navercorp.com>
 * 
 *  This program is free software: you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the Free
 *  Software Foundation, either version 2 of the License, or (at your option)
 *  any later version.
 * 
 *  This program is distributed in the hope that it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 *  more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program. If not, see <http://www.gnu.org/licenses/>.
 * 
 * -----------------------------------------------------------------------------
 * 
 *  Rhymix is a derivative work of XpressEngine (XE) version 1.x.
 *  The license has been changed from LGPL v2.1 to GPL v2 in accordance with
 *  section 3 of LGPL v2.1. This change is irreversible and applies to all of
 *  Rhymix, including parts that were copied verbatim from XpressEngine.
 * 
 * -----------------------------------------------------------------------------
 */

/**
 * Include the autoloader.
 */
require __DIR__ . '/common/autoload.php';

/**
 * @brief Initialize by creating Context object
 * Set all Request Argument/Environment variables
 **/
Context::init();

/**
 * @brief Initialize and execute Module Handler
 **/
$oModuleHandler = new ModuleHandler();
$oModuleHandler->init() && $oModuleHandler->displayContent($oModuleHandler->procModule());

Context::close();

/* End of file index.php */
/* Location: ./index.php */
 

텍스트파일이 다운받아집니다. PHP fpm이 문제가 아닌가요?

위 사진은 /etc/nginx/sites-available/example.com 디렉토리입니다