I'd hardly equate this to the Dead Sea Scrolls, frankly. Yes, it's an old book of Psalms, but there's no new information in it. the Psalms date back way before 800 A.D.
Nice find, though.
"there's no new information in it."
Well, with the exception of the "copper scroll" (which was possibly a listing of the contents of the First Temple), there wasn't much "new" information in the Dead Sea Scrolls.
What they did was confirm that our current Bible is --- nigh word-for-word --- the same as then, despite all that hand copying by scribes.
This (presumably) will do much the same, in an interim sense.