This is a change from the old ban system. The previous ban system would hide all of a member's postings while they were banned, and unhide them when the ban expired. I am sure that you can see the potential flaw in that system. Now, when a post (or OP) gets reported/muted/hidden with reasons other than "meh", and the reports are adjudged as accurate, the member is banned and the post is removed. Forever. Their other posts are not hidden (there's discussion about refining that) but the reported one? Gone forever. Even after the ban is over. And that is the difference between then and now.