As per the web page:
The Virginia Edition will be printed on 50# natural writer's white acid-free paper, and bound in bonded and embossed burgundy leather.
Would this be as good as rag paper?
Wow...not sure. Better do some research. I just know that most modern books use paper that won’t last 50 years or so.
Hope that the price they charge means they are using the best...but I’m don’t know enough to know those stats are good or what.