What is jared diamonds explanation for why the spanish had advanced to steel swords while incas were still making tools and weapons from bronze?

Jared Diamond put forth the idea that the Spanish were able to acquire steel swords because of their close proximity to the fertile crescent, who had invented the technology necessary to wield and mold steel. The Incans were a world away and so did not benefit from the technological advancement in regards to steel.

they died with poison from the god patrick