> 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".
difficulty: not an archaeologist but a SWE
cut the guy/gal some slack
Maybe don't publish archaeology "findings" and "discoveries" if you're merely a software developer. I don't go around publishing things about nuclear reactors, because it's not my area, I couldn't even review myself if it's right or not.