He checked with the Mexican government before claiming it was new, which is reasonable due diligence surely?!

No, you don't just do the simplest possible thing and see if it's in some DB because it happens to be more accessible to LLMs, then call it a day and a call it a "discovery". More from the Bluesky thread:

> any archaeologist knows to triple check before saying something is "new"

There is lots of due diligence needed before proclaiming stuff like that. Not just in archeology, but in sciences in general. There is an expectation that you'll review what you put out carefully, not rush to publish as soon as possible, and review prior art. Not least because it's embarrassing as hell to accidentally claim to have invented/discovered something, but in reality someone else was clearly way earlier than you, you just didn't look closely/broadly enough before.

As a second thing, once you find out you're wrong, you generally want to retract something to save face, if you're a good enough human to be able to admit when you're wrong. The author's "What I've learned" remains "You can just do things" even though the top of the article now has a correction that the agents maybe "missed it while going through the literature".