Because (a) by the rules of engagement, management is not required to share original feedback, and (b) the original feedback could be used to identify the sources. In this case, there might have been a real risk to the sources given the individual in question is known to mobilize internal and external forces like Twitter mobs to personally attack people and bully them into submission.
To clarify, the first paragraph of defertoreotar@'s comment is a quote from Timnit Gebru's tweet where she admits to recently conspiring a legal battle against Google, while on Google's payroll. A wolf in sheep's clothing...
She has been advancing her agenda for a while by strategically picking fights, and winning them because she's been on the right side of a political wave and knew how to ride it. Then she got blinded by her own success and overplayed her hand, a classic cautionary tale. Fun fact: many people, not necessarily managers, won't be shedding tears seeing her go.
Technical aspects aside, this post is in a really bad taste.
Next time you're itching to show off your chops, maybe pick a project that does not involve airbrushing people somehow deemed unworthy of being remembered, based on their looks?
During world war II, the Nazis had the laborious task of detecting Jews among the occupied populations, at scale. Is that also a task worthy of being automated and then writing a post about it?