NFL did have its own production team for the NFL Network when they were doing games by themselvesCool of ESPN to allow Hannah Storm to do that. I'm assuming that ESPN didn't mind as they have an financial interest in the NFL as well
That still doesn't explain though whose footing the bill for producing those games. If the NFL gave the full TNF rights to Amazon, is Amazon producing those games or will the NFL be responsible for doing so? It's one thing to have commentators, but there's other production and presentation aspects as well.
I'm assuming Amazon bought the whole package that included the NFL in house production team because games do have to look a certain way
Also the pandemic has taught these sports departments that we don't need to send everybody to the game just because
Andrea and Hanna can do every game from a studio in LA or NY with the NFL running the production from the game.