The dates are one thing, the technology is another, IOW, stone (which is after all still in use) was supplanted by copper, on into bronze, and thereafter into iron, at different times in different places. For example, the bronze age in the Americas came along quite a long while after it was over elsewhere in the world.
But the "before we discovered iron we had only stone and bone tools" is really off the mark.
Copper was around and certainly being used at that time and not THAT far away.
Which is why I am hoping there was a translation error.
A few years back there was one where they used the word potato when what the person originally said was millet.