White Smoke and Leer

How is Quilava able to lower my Torkoal’s Defense with Leer when it has White Smoke? Isn’t it supposed to work the same as Clear Body? I have a video footage of it that was recorded on December 25, 2012 and uploaded to youtube on January 15, 2013. I tried asking this question on smogon and it was never answered. I tried making this thread on gbatemp but then they just closed it down and banned me.

Start here! https://www.youtube.com/watch?v=c88aHpzXTcE&t=3697s