Thank for posting the URL some days here we have up to 30% of those posting who are posting to the wordpress forum and ought to be posting to wordpress.ORG for support.
This is the entry for stats http://en.support.wordpress.com/stats/
The following are not counted:
* Visits from registered users of the blog when they are logged in.
* Visits to uploaded documents and files
* GoogleBot and other search engine spiders.
I believe that means that the stats that are counted are those who click into the wordpress.com blog post - 1 page view. The clicks through your posts and out to youtube would be reflected in your outgoing clicks. If you need greater clarity then you I suggest you contact Staff http://en.support.wordpress.com/contact/