It is not hearsay. Emails are documented evidence
Universities cannot do that based on one-sided hearsay. If the offers are outstanding, they will stay such until the stated offer dates, which they can choose not to extend. There would be major legal implications, especially at a State University like UCLA.
Hopefully all SS tenured offers will rescinded. Unacceptable behaviour by an academic who himself benefited hugely from patronage by influential seniors (like JVR, Propper)