Отредактируйте ТДС "Google SiteMap" и замените запрос:
$query = "SELECT * FROM structure_table
WHERE `site_id` = '{$site_id}'
ORDER BY structure_parent_id, structure_order, structure_menu_name";
на:
$query = "SELECT * FROM structure_table
WHERE `site_id` = '{$site_id}'
AND `structure_change_frequency` = 0
ORDER BY structure_parent_id, structure_order, structure_menu_name";