It's not a matter of "rejected as not real", it's "There's no way to know if this is real or not".
When 99% of people are posting pics from their big tech approved smartphones with the "200% real no way to fake this" badge it doesn't matter that absence of the badge technically doesn't mean fake, that's what it will be interpreted as.
The defendant submitted a remarkably high quality video of you saying you generated it with Nano Banana.
And their video was C2PA signed.
You can even do it wholly in an analogue process, do a darkroom print, and it could be seen as fake as well - darkroom techniques are quite flexible as well. And a negative itself? That could be a copy of a prepared printed slide.