If that's your standard for "champion of transparency", then nobody fits the bill. Everybody has something to hide, even reporters who champion for transparency would hide the identity of their sources.Again, morally inconsistent.
Elon bought the legal right to do release private internal communication from years ago, but,
as he's doing, in many cases, with any regard of privacy, and at the same time threatening to sue current employees for talking to the press, he has not earned any moral right to do so.
You can't be a champion of transparency and not be transparent, sorry.
Twitter releasing private internal communication regarding their past behavior towards their users and Twitter protects their current internal communication regarding sensitive company information are entirely consistent legally and morally, no different from my reporter example above.