Everyone except the person in question has incomplete knowledge of what was said; information asymmetry easily happens when conversations span multiple topics, places, and public/private spaces. At some point I think you have to decide if you trust that the people making the decision had enough information to say and do what they did compared to the information any of us may have been personally privy to.
My takeaway from that is you need to make sure that you have permission from the person who was banned or removed to name them publicly, otherwise you risk outing them when they didn’t want to be publicly named.