Well, the source was Amazon themselves but I am not certain where you would find that announcement. It was posted by the people at blu-ray.com when Amazon made the deal. This was a while ago. It's not a claim and it has been verified by people that have purchased the discs including myself when...
Amazon cut a deal to burn these Paramount releases as they need them. Everybody else gets pressed discs shipped to them from Paramount. So, if you want a pressed disc, don't buy from Amazon.