Yep that’s how it works. Older content past a certain date is cached which is why you can’t comment or post on some old posts.

There is none. There are some rumors and past allegations but no evidence or confirmation on why he was removed. Not sure why so many people go around spouting random things as facts.

I also read yesterday metas statement on this and the threads team doesn’t have any previous Twitter employees. They all work on other teams. Such a problematic world we live in.