HELP username shortcode not working !

I can verify the above. In fact none of these merge tags are working, either in the heading or email body:
{{xlwuev_user_login}}
{{xlwuev_display_name}}
{{xlwuev_user_email}}

Replace the following functions at” ./wp-content/plugins/woo-confirmation-email/includes/class-xlwuev-common.php

protected static function xlwuev_user_login() {
return get_userdata(self::$wuev_user_id)->user_login;
// return self::$wuev_user_login;
}

protected static function xlwuev_display_name() {
return get_userdata(self::$wuev_user_id)->display_name;
// return self::$wuev_display_name;
}

protected static function xlwuev_user_email() {
return get_userdata(self::$wuev_user_id)->user_email;
return self::$wuev_user_email;
}