in theory, a delicate ecosystem built around Bronze collapsed. to make weak sauce Iron work you had to be a) very desperate and b) very clever. which scales for those who figure it out
the post in question doesn't even mention Ugarit. or Arsenic. i am genuinely pissed off at the original tome being passed off as genuine discourse:
https://en.wikipedia.org/wiki/Ugarit
just pure charlatanry