AWStats on Debian 10 with ngnix - separate domain setup

awstats.conf

server {
        listen 80;
        server_name awstats.EXAMPLE.COM;
        root    /var/www/awstats;

        error_log /var/log/nginx/error-awstats.log;
        access_log off;
        log_not_found off;

        location ^~ /awstats-icon {
                alias /usr/share/awstats/icon/;
        }

        location ~ ^/$ {
                rewrite ^ /awstats.pl?config=EXAMPLE.COM;
        }

        location ~ ^.*\\.(cgi|pl|py|rb) {
                if ($args ~ "config=([a-z0-9-_\.]+)") {
                        set $domain $1;
                }

                auth_basic "Auth";
                auth_basic_user_file  /etc/awstats/awstats.htpasswd;

                gzip off;
                include         fastcgi_params;
                fastcgi_pass    unix:/run/php/php7.3-fpm.sock;
                fastcgi_index   cgi-bin.php;
                fastcgi_param   SCRIPT_FILENAME /etc/nginx/cgi-bin.php;
                fastcgi_param   SCRIPT_NAME /cgi-bin/cgi-bin.php;
                fastcgi_param   X_SCRIPT_FILENAME /usr/lib/cgi-bin$fastcgi_script_name;
                fastcgi_param   X_SCRIPT_NAME /cgi-bin$fastcgi_script_name;
                fastcgi_param   REMOTE_USER $remote_user;
        }
}

cgi-bin.php

<?php
$descriptorspec = array(
   0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
   1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
   2 => array("pipe", "w")   // stderr is a file to write to
);
$newenv = $_SERVER;
$newenv["SCRIPT_FILENAME"] = $_SERVER["X_SCRIPT_FILENAME"];
$newenv["SCRIPT_NAME"] = $_SERVER["X_SCRIPT_NAME"];
if (is_executable($_SERVER["X_SCRIPT_FILENAME"])) {
   $process = proc_open($_SERVER["X_SCRIPT_FILENAME"], $descriptorspec, $pipes, NULL, $newenv);
   if (is_resource($process)) {
       fclose($pipes[0]);
       $head = fgets($pipes[1]);
       while (strcmp($head, "\n")) {
           header($head);
           $head = fgets($pipes[1]);
       }
       fpassthru($pipes[1]);
       fclose($pipes[1]);
       fclose($pipes[2]);
       $return_value = proc_close($process);
   } else {
       header("Status: 500 Internal Server Error");
       echo("Internal Server Error");
   }
} else {
   header("Status: 404 Page Not Found");
   echo("Page Not Found");
}