Iron making was known during bronze age, but it was technically more challenging that tin+copper because it requires higher temperatures.
It's amusing to note that it lead to the development of the iron/steel making techniques, so much so that once the tin "was back", steel was cheaper, more reliable (from the logistics perspective) and better.
[1] https://en.wikipedia.org/wiki/Tin_sources_and_trade_during_a...
Scott Alexander wrote a critique of it beginning "Julian Jaynes’ The Origin Of Consciousness In The Breakdown Of The Bicameral Mind is a brilliant book, with only two minor flaws. First, that it purports to explains the origin of consciousness. And second, that it posits a breakdown of the bicameral mind. I think it’s possible to route around these flaws while keeping the thesis otherwise intact..." [2]. A response (which I have not yet read) can be found here [3].
[1] https://www.julianjaynes.org/about/about-jaynes-theory/overv...
[2] https://slatestarcodex.com/2020/06/01/book-review-origin-of-...
[3] https://www.julianjaynes.org/2023/09/04/fact-checking-scott-...