The artifact in question, to clarify, is almost certainly a 19th century forgery. But there's an element of doubt that persists, particularly because the 20th century Dead Sea Scrolls were found in the same region, and under similar circumstances.
Any element of doubt has been destroyed by the comprehensive carbon dating tests run on the DSS that show them to be 2000 years old plus change. The author doesn't mention this. And someone needs to tell him that the Documentary Hypothesis is dying.
I'm pretty sure the element of doubt your parent refers to is "doubt that the Shapira fragments were forgeries", not "doubt that the Dead Sea Scrolls are authentic".
I can't shake the feeling that something in your comment went over my head, though... could you say something at greater length?
> And someone needs to tell him that the Documentary Hypothesis is dying.
It's been a long time since I pursued my interest in biblical criticism, and don't know of critiques of the documentary hypothesis. Where can I find out more about it? Thanks!
