Is there a link to that thread? I've watched Cline's 1177 BC video and he made a good argument for it. I'm inclined to believe that Civilization is not guaranteed so having it collapse seems quite plausible.
The so-called collapse is a consequence of a repeating of a few centuries of history, a mistake created a few hundred years ago before much was known and before scientific dating methods were available. It’s a chimera. The puzzle about why it happened is the wrong question, it didn’t happen.