Presumably some “chat” happened between his last post before “slip” and “slip”?Not really, from his perspective, since he was already contributing to the thread.
These were two posts he made prior, just to establish he calls the thread a thread, and that he's caught up and not in the process of rereading.
Last post before "slip"
His "slip"
So in the span of 20 posts or so from the above he feels compelled to say he doesn't have much to say, despite already having posts, voting, being caught up. Even if you remove the slip angle entirely it feels very fake.