So of course, this article doesn't help define "dignity," and it isn't clear how significant it is, if really at all.

No, but the full declaration does. It defines several forms of dignity.

The full declaration is here.

Yet, your comment above indicates you are relying on a report by a journalist to tell you what the declaration says and "how significant it is". The declaration isn't that long, so perhaps it's worth reading rather than relying on a journalist?