Gebru sent a conditional resignation(ultimatum) letter to Google. Google rejected those conditions and accepted her resignation. Whether or not you count that as resigned or fired is a definitional issue. But legally there are many jurisdictions that consider an ultimatum letter a resignation. The general rule has been "Would a reasonable person who read this letter conclude they had the intention of quitting if their conditions were not met?". And Gebru's letter really made it seem like she has every intention of quitting if her conditions were not met.
So this is definitely not lying in an easily verifiable way.
> No I'm saying there's probably more information that we're missing that completely changes the circumstances (as was the case if you only looked at Google's statements on Gebru's firing).
This is probably true, I'm not saying we know the whole story. I'm arguing that it is highly probably(>90%) she exfiltrated data from Google.
> The word on the street is that she saw a wrongful termination coming and made backups of emails to discuss with her lawyers.
This might be entirely possible, but this also gave them reason to terminate her so it seems like a very bad move.