If these are the best excuses for lack of full transparency one could could come up with, then why would anyone choose a Linux distro? Or any of the *BSDs for that matter? Transparency and an expectation of due diligence is why a lot of companies (in IT and elsewhere) still stay in business while choosing Open Source software.
Besides, Postgres isn't some run-of-the-mill startup with a dropped letter domain name. It's a venerable software foundation with almost 20 years of work and experience behind it. Which makes this a questionable course of action on their part despite the need for discretionary release.