Not sure where you got the quote from. Either I am missing it or someone corrected it after your quoted them.
In either case, it was a group of 1863 Double Eagles - not 1983, which makes a lot of sense because there haven’t been any Double Eagles since 1933.
You didn’t see it in the article at the link? It’s still there. It hasn’t been corrected and that would be hard to do posting from an original article.
“”A total of 700 gold coins were buried on the farm and the hoard included a group of 1983 Double Eagles””