His post is quite well summarised by his second sentence. "Gell-Mann Amnesia" gets quoted a lot as "why trust journalists when you know they misunderstand stuff you understand", but Crichton's actual article wasn't just targeting the media but expertise in general and the idea that there was any point to making any predictions at all about the future, without any evidence base and with a layman's drive by attack on climate science, economic forecasting and medical testing ethics. Ironically considering the contexts the Gell-Mann Amnesia meme gets used, Crichton's article that coined it was a pretty broad ranging rant including about academics doing science!

And I say this as someone who's cited the Gell Mann Amnesia effect meme before without having come across Crichton's original article.