This variety was gone, for 2000 years. The origin date was pretty firmly established. 'IMHO' is worth much less than a measurement, which indicated from 2200 to 1800 years.

"IMHO" there are a lot of well known problems with carbone datation. You can read about it in scientific journals and make your own opinion.

Any measurement can have errors of methodology, and a wrong measurement does not have any value. Don't worship numbers just because they seem fancy or fit with a narrative. They are just that, a number.

Without a genetical analysis we can not know if a plant variety is lost, or just forgotten, or a clone of a extant variety buried ten years ago. Show me the analysis before to start talking abour old ruins, caravans and lost cities.

So theres uncertainty in dating, and its only 1000 years extinct? This is more FUD.

Keep thinking about the problem and you will eventualy find the big, huge, ginormous, elephant in the room.