From my marketing experience, this has nothing to do with COVID or shipping delays or anything else Nvidia might say. The announcement of the RTX 3080 showed performance gains that are far more impressive than what the card will actually deliver based on various leaked benchmarks from reviewers with cards in hand. Nvidia doesn’t want to allow enough time for real benchmark review data to propagate and lower the hype/demand for the cards. So instead of giving people 3 days to see it, read it, share it, make videos on it, etc etc....it wants to switch to sales mode immediately with the current level of enthusiasm that exists.
Reviewers asking for more time to review has nothing to do with the NDA being lifted. You can choose to believe that this is the reason. Nvidia will thank you for believing it. But this is ultimately a marketing decision to start sales before enthusiasm and hype for the card drops.
Blaming things on COVID is the equivalent of calling anything that uses a basic “if then else” statement “Artificial Intelligence.” You can say it. But doesn’t make it true.