There are screenshots in the suits of concrete messages from people claiming they do each of these actions. At this point the question seems mostly to be about if this is systematic or just individual actions.
There is a lot of smoke for there to be no fire. However, who knows. Personally I have seen the same behavior where I work so I am not surprised if this is all true.
Screenshots, without evidence of provenance, of anyone saying anything are trivial to create; they aren't evidence just part of the accusations.