Carbon datng is actually pretty useless as it was recently learned that radioactive carbon’s rate of decay is affected by the distance of the earth from the sun. This means that’s it’s rate of decay is not always a steady rate.
Actually, that statement is pretty useless.
Radiocarbon variations over time are known because of tree ring studies, and studies of coral. The rate of variation is very small, but can make slightly older rings appear to be the same age as younger ones, because the C14 uptake was higher in the earlier years when the rings were grown. Samples from plants grown in soil higher in regular carbon (C12), such as volcanic ash, will appear to be older than they are, so samples of that kind are avoided.
Except at Thera, at Thera those results have been embraced in order to prop up the supereruption nonsense.