I don't usually like to gatekeep but knowing that "Au==gold" is one of those basic facts that everybody on a forum like hacker news should know and find unremarkable.

You might even say it's puts on sunglasses periodic table stakes.

Actual intelligence might be[0] to know what typos (of any kind) are fun to riff off.

Maybe this didn't hit the mark for you, but it got a chuckle out of me (especially considering the last hype before AI was crypto).

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[0] I don't even try to figure that out anymore, in a few years I'll pick the definition that I think best captures my thoughts

See that way too often in comments like this. Anyway, it was pretty likely they knew it was a typo, it was just a funny response.