Pfizer had contracts with many nations around the world. Money was paid, a deal to restrict their ability to talk about it was cut. Apparently according to people privy to those deals, the NDA included even mentioning that there was a deal with Pfizer.

This is old in that it has been rumor (ie no physical evidence, copies of the agreement, relevant text, or other proof of anything) for many months. Rumors saying "it's coming" don't mean much. Sometimes you need to put up or shut up.