Honestly, the best evidence they could provide to someone like that is suing Madison for defamation and winning. But they don't want that, I don't want that, and I'm sure you don't want that either. It would also look mega bad for LTT. Which is why I think they mentioned that they could sue in the post, but chose not to.
And it's not like some rando is going to be invested enough to pay a 3rd party to investigate LTT without a conflict of interest being there.
Everything else kinda needs to stay locked up due to employee privacy and data protection laws. So, I honestly can't see how they can "win".
I will say, LTT is a big corporation, and there is a massive power deferential between them and a single person. And given how difficult it is to stand up that, especially when you're afraid of rocking the boat and losing your job, plus how fucking annoyed I am about the Billet Labs debacle and how they responded to that. I still believe that most of what Madison said was true, or at the very least, she believes what she's saying is true