wordpress-website-lifecycle/mu-plugins/theme-avada.php

<?php

/*
 * Plugin Name: Avada theme settings
 * Plugin URI: https://github.com/szepeviktor/wordpress-website-lifecycle
 */

/**
 * Disable Fusion Patcher.
 */
class Fusion_Patcher
{
    public function __construct($array)
    {
    }

    public function get_patcher_checker()
    {
        return new Fusion_Patcher_Checker();
    }
}

/**
 * Disable Fusion Patcher Checker.
 */
class Fusion_Patcher_Checker
{
    public function get_cache()
    {
        return [];
    }
}

/**
 * Disable Fusion Updater.
 */
class Fusion_Updater
{
    public function __construct($object)
    {
    }
}