Zaion already demonstrated that any NDA is toothless.I'd love to see Selen break NDA. If she really was facing harassment, she could probably fight the breach of NDA and be protected as a whistleblower. Not sure what effect that would have on her standing in Japanese communities, though. She is pretty deep in that scene.
I also hope she wouldn't be prevented from collabing with Hololive talents, either. Something I just thought of while typing this is that Dimitri Jap reposting her termination is kinda interesting in that it is possible he has worked with her before, if he is involved in Stars management, too.
The JP esports scene is a different matter, of course. Selen won't want to burn that bridge, and I suspect the only way to not burn that bridge with a Zaion style document would be Niji JP collapsing. Current rifts notwithstanding, that seems unlikely.