Wisdom teeth alone don't prove or disprove anything. For what it's worth, however, I have one wisdom tooth, which erupted a few weeks after its neighbouring molar had to be removed due to an infection (caused by an injury, my oral hygiene is perfectly fine). None of my other wisdom teeth have erupted, and I still have all of my other molars. Losing a molar often encourages you wisdom tooth to grow in, not just in my case either. This would seem to support the theory that our wisdom teeth acted as backups for the time when we lacked dentistry, and were prone to losing our teeth.
I plan on keeping this tooth, even though it creates minor discomfort. It grew in at a weird angle due to the missing molar, so it, unlikely my other wisdom teeth, manages to kind of fit into my jaw, and it gives me more biting space. I'm getting the other three removed when they start to come in, though. Based on x-rays, they aren't going to fit into my jaw, particularly the top two.
So, I wonder what my mouth proves by this guy's logic? That one quarter of our bodies were created, and the rest evolved? Evolution is 1/4 false and 3/4 true? Who knows?