They definitely had some technology but honestly the things you listed.... were not that far off from stone age as people often act. People often underestimate just how much early people actually could do or had with technology. I mean really a lot of what is listed isn't actually far off, if not the same, as what other civilizations over 4 thousand years ago had and it lots of areas they were behind them, and we are talking just a few hundred years ago for them. In areas that would have had nothing reasonable to do with iron too. That doesn't mean they didn't have some strong advancements of course.... but honestly that is a pretty bland list when you actually compare it to other places in history.

I think when people call them stone age though it does underrepresent their technology. Not because it is an inaccurate statement, but just some of the false connotations people have with stone age = brain dead cave men scared of fire type stuff.