The article says that Google will be penalizing sites now if they have to many DMCA takedown requests that Google has acted upon -- but only web search takedowns. Since YouTube has a separate takedown system, it doesn't get counted against all those other sites, even though potentially, it has a huge number. We don't know, because Google doesn't report them. I don't think Google's trying to be tricky in doing this. I just think that, as a consequence of how it handles DMCA requests, YouTube is getting a huge pass that other sites won't get.