he doesn't know anything.. they have only affected people that have pre-existing kidney problems and even then that was a small number. here's an article for you.
http://forums.bulknutrition.com/?showtopic=4959
http://www.bulknutrition.com/?ingredients_id=1
both have a wealth of information about the FACTS on creatine. Also, in the second link, click on the cited references and read more about it.