Using advanced radiocarbon dating, it may be "up to several decades older than previously thought". And "at least 20 years older" – back to about AD1420, instea

Using advanced radiocarbon dating, it may be "up to several decades older than previously thought". And "at least 20 years older" – back to about AD1420, instead of AD1440-1450. So this isn't a massive revision changing big conceptions about pre-Columbian Incan society - just a hint Spanish interpretations of native records, post-conquest, somewhat off.