Look at the bottom. It has a numbered Notice. I would be surprised if that wasn't distributed the Post Offices or if the clerks are responsible to stay abreast of such notice releases.
PSN 7610-07-000-4037
Notice 121, October 2012
That's over a year and a half old. I've shipped media a lot since then although none within the past 6 months. Nothing has changed that I have seen.
This debate has been going on for years and for the most part, it's the buyer who requests media to save on shipping in my experience. In that case, he/she would be responsible if additional was due upon delivery. Otherwise, its the seller who should pay.