cache="no" ignored

function apl_get_plugin_data( $cache ) {

	// Attempt to get plugin list from cache

	if ( !$cache ) { $cache = 'no'; }

	$plugins = false;
	$cache_key = 'artiss_plugins_list';
	if ( !is_numeric( $cache ) ) { $plugins = get_transient( $cache_key ); }

	// If not using cache, generate a new list and cache that

	if ( !$plugins ) {
		$plugins = get_plugins();
		if ( ( '' != $plugins ) && ( !is_numeric( $cache ) ) ) { set_transient( $cache_key, $plugins, 3600 * $cache ); }
	}

	return $plugins;

}

Because of if ( !is_numeric( $cache ) ), cache is always used.

http://wordpress.org/extend/plugins/plugins-list/