1. Counter-suing assumes that Doki/Selen sued/tried to sue Niji in the first place. While she could be lying, by Doki's own statements she seemed to want to end the contract and move on.According to this thread, there is a possibility of nijisanji countersuing dokibird. However, post >>69142762 says otherwise. The thread is still active and yet archived. Photo attached is the photo of the OP
Edit: Again? File is too big?
Here's the OP photo
2. Everything defamatory that has been made public has been Niji and their livers themselves, even then Doki specifically goes out of her way in her statements to not defame specific people. The closest we got was that she said she was bullied and harassed while in the company by company internals. Which could MAYBE be seen as defaming Niji.
3. The person claiming this is a known shitter and idiot.