Someone posted
>gay
Too. And that was either in the thread or another one, and a new thread don't exist.

The problem with the puzzle that it seems a guesswork.
I get it that the threads are "hidden" (actually, display: none). But that doesn't help.
I'd expect something posted and were set to "hidden" but beside my thread there was nothing.
Beside the pw could be pw in berndese, berndese, hidden, post/posts, thread/threads. None works as pw.
Board, I haven't tested yet.