This is the type of rumor mongering that hurts the community and its environment.
1st: No discussion was “deleted” - part of it was hidden by the system when flags were made. If you wanted to read the flagged posts, you had the option to do so. The system (Discourse) hides flagged posts as a measure to allow those wanting to see problematic posts to skip reading them.
2nd: The thread was closed until the moderators had a chance to review the situation and it was to provide a cooling off period for those involved.
I know you want to be a voyeur with regards to what happened but it is detrimental to our community to rumor monger and fling accusations the way you have.
If you go into options and enable viewing 18+ content. The exact procedure eludes me for the moment but it starts in your user control panel.