I deleted that thread but your search probably found a post that someone had already started writing when I deleted it. So, you found a post that has no thread, which is why you get the login screen.
Frankly, I am tired of the "leaving DCUM threads". If someone wants to leave, they can just leave. I used to call these "good bye cruel world" threads. But, we can't tell one anonymous from another so we don't really know who is leaving. I don't understand the need for a big production about it.