Could this be a preview of the Rams end zone? Looks like it could be recent. One of the photos looks like it has the Fox Sports set still on the field. Don’t remember we the NFL logo in the end zone yesterday
https://www.timesleader.com/news/1536924/two-wyoming-valley-natives-working-on-super-bowl-lvi-field
If they arent going to outline the wordmark I actually think the white Falcons wordmark in the endzone works better than black. I think it's easier to see.
It could still be a red endzone for the Falcons. I would think if you already had the black paint out to do the sideline box, why wouldn't you just continue with the Falcons endzone? Maybe they are painting the Patriots endzone blue and then breaking out the red paint for the Patriots sideline and the Falcons endzone.