> Dendrochronology has dated the felling of the oak tree of the panel to 1483, which, accounting for the seasoning of the wood, suggests a date for the painting of soon after 1500.
Sounds like they have only dated the wood in the frame to 1500. Hopefully they will do some more research and get more proof.
For reference, Han van Meegeren used old frames and old canvases to forge his works. The article on his career is fascinating.
How rare paintings from 1500+ really are? I am genuinely asking. Some old artifacts (ie: 3000 BC) are valuable, but most artifacts are not. And there is literally tons of very old artifacts.