Slandered, how? https://twitter.com/timnitGebru/status/1331757629996109824?s... seems to be the complaint. This seems plausible given her work to push towards less biased data/algorithms got squashed and she resigned.
Hiring has apparently failed to meet goals with zero consequences suggesting a lack of concern with minorities.
I don't think someone misinterpreting disregard for ethical ai research as disregard for minorities is slanderous, heck it might be charitable as the later is known.