A few times a day I go back to Reddit and see that subs I had followed are back to public and my comments in those subs are now visible in my history. So I delete the comments and leave (un-join) that sub. What that is showing me that there is a trickle.of subs flipping from private to public all throughout the day. (It does not mean that they will comply without protest going forward. They also may have new subs, ljke r/privacy. ) So if you want to make sure that your posts and comments are gone you will have to check more than once.
A few times a day I go back to Reddit and see that subs I had followed are back to public and my comments in those subs are now visible in my history. So I delete the comments and leave (un-join) that sub. What that is showing me that there is a trickle.of subs flipping from private to public all throughout the day. (It does not mean that they will comply without protest going forward. They also may have new subs, ljke r/privacy. ) So if you want to make sure that your posts and comments are gone you will have to check more than once.