If I say "I demand X or else I resign", (I don't know if that was actually said) I think it's fair to consider that a conditional resignation.
Timnit responded with an email requiring that a number of conditions be met in order for her to continue working at Google, including revealing the identities of every person who Megan and I had spoken to and consulted as part of the review of the paper and the exact feedback. Timnit wrote that if we didn’t meet these demands, she would leave Google and work on an end date. We accept and respect her decision to resign from Google.
I would say that describes a conditional resignation, and the fact that she called this “being fired” indicates she didn’t really plan to resign (ie. she was bluffing).
The person who benefits from your doubt, _and_ could resolve your doubt, chooses not to.
She cannot and will not expose that information without inviting all sorts of litigation. This is not a case where she can just "choose" to release that information.
So, she might be choosing not to for this reason.
A threat to resign isn't the same thing as resigning. And it seems you don't think so, either, since you characterize her threat as a bluff. It can't be both a bluff and a resignation.