Board Thread:Support Requests - Getting Technical/@comment-9605025-20200825213015

I am trying to develop a script to scrape some Forum data (moves, closures, removals, etc.) before it is no longer available. I have noticed that when a thread is "deleted", there are several different effects that may appear. From past experience I believe these arise from differences in what the various deletion methods actually delete. I am going to list the effects I have seen. If someone could help identify the deletion mechanism used in each case, that would be much appreciated. My suspicion is that #1 and #2 are what happen when the content page itself is deleted from the Board Thread namespace and #3 is some sort of soft deletion that is part of the Forum extension. However, I am not entirely certain and I also don't have a guess for #4.
 * 1) Links in Special:RecentChanges change to "Thread:0" which redirects to the main page
 * 2) Going to the page in the Thread namesapce redirects to the main page like "Thread:0" does
 * 3) Going to the Thread namepsace produces a "The message you are trying to view has been deleted." with a link back to the board the thread was posted on
 * 4) Going to the Thread namespace produces the regular "this page has been deleted, here is the log entry" message

Also, I couldn't find any recent examples of #4 so if anyone has an example, it would me much appreciated. 