This is absolute nonsense. One could hire a private plane to courier the piece from Palermo to the USA for $10,000. That is a price put in by the seller to discourage overseas shipping. I have seen that done on more than one occasion. Best to simply not deal with any international sales.
But, aside from that, eBay is notorious for having bad shipping calculations. Not that bad, but bad.
I do not blame the international postal services for halting shipments to the USA. We have nothing but chaos in almost everything that the administration is touching. Customs and tariffs and valuations of imports are top of the list.